Let's take a look at a couple scriptures.
Many claim Jesus declared all meats clean, here is the story told in Matthew and Mark. One version is the 1611 KJV in original Archaic English.
As we can see, it's about washed hands and traditions of men, not about the dietary law concerning clean and unclean animals.
Matt 15:1-
15 Then came to Jesus scribes and Pharisees, which were of Jerusalem, saying,
2 Why do thy disciples transgress the tradition of the elders? for they wash not their hands when they eat bread.
3 But he answered and said unto them, Why do ye also transgress the commandment of God by your tradition?
4 For God commanded, saying, Honour thy father and mother: and, He that curseth father or mother, let him die the death.
5 But ye say, Whosoever shall say to his father or his mother, It is a gift, by whatsoever thou mightest be profited by me;
6 And honour not his father or his mother, he shall be free. Thus have ye made the commandment of God of none effect by your tradition.
7 Ye hypocrites, well did Esaias prophesy of you, saying,
8 This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me.
9 But in vain they do worship me, teaching for doctrines the commandments of men.
10 And he called the multitude, and said unto them, Hear, and understand:
11 Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.
12 Then came his disciples, and said unto him, Knowest thou that the Pharisees were offended, after they heard this saying?
13 But he answered and said, Every plant, which my heavenly Father hath not planted, shall be rooted up.
14 Let them alone: they be blind leaders of the blind. And if the blind lead the blind, both shall fall into the ditch.
15 Then answered Peter and said unto him, Declare unto us this parable.
16 And Jesus said, Are ye also yet without understanding?
17 Do not ye yet understand, that whatsoever entereth in at the mouth goeth into the belly, and is cast out into the draught?
18 But those things which proceed out of the mouth come forth from the heart; and they defile the man.
19 For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
20 These are the things which defile a man: but to eat with (((((unwashen hands defileth not a man.))))))
(KJV)
Mark 7:1-20 (KJV)
1 Then came together unto him the Pharisees, and certain of the scribes, which came from Jerusalem.
2 And when they saw some of his disciples eat bread with defiled, that is to say, with unwashen, hands, they found fault.
3 For the Pharisees, and all the Jews, except they wash their hands oft, eat not, holding the tradition of the elders.
4 And when they come from the market, except they wash, they eat not. And many other things there be, which they have received to hold, as the washing of cups, and pots*, brasen vessels, and of tables.
5 Then the Pharisees and scribes asked him, Why walk not thy disciples according to the tradition of the elders, but eat bread with unwashen hands?
6 He answered and said unto them*, Well hath Esaias prophesied of you hypocrites, as it is written, This people honoureth me with their lips, but their heart is far from me.
7 Howbeit in vain do they worship me, teaching for doctrines the commandments of men.
8 For laying aside the commandment of God, ye hold the tradition of men, as the washing of pots and cups: and many other such like things ye do.
9 And he said unto them, Full well ye reject the commandment of God, that ye may keep your own tradition.
10 For Moses said, Honour thy father and thy mother; and, Whoso curseth father or mother, let him die the death:
11 But ye say, If a man shall say to his father or mother, It is Corban, that is to say, a gift, by whatsoever thou mightest be profited by me; he shall be free.
12 And ye suffer him no more to do ought for his father or his mother;
13 Making the word of God of none effect through your tradition, which ye have delivered: and many such like things do ye.
14 And when he had called all the people unto him, he said unto them, Hearken unto me every one of you, and understand:
15 There is nothing from without a man, that entering into him can defile him: but the things which come out of him, those are they that defile the man.
16 If any man have ears to hear, let him hear.
17 And when he was entered into the house from the people, his disciples asked him concerning the parable.
18 And he saith unto them, Are ye so without understanding also? Do ye not perceive, that whatsoever thing from without entereth into the man, it cannot defile him;
19 Because it entereth not into his heart, but into the belly, and goeth out into the draught, purging all meats?
20 And he said, That which cometh out of the man, that defileth the man.
21 For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,
Mark 7:1-20 (1611 kjv. Original English Archaic spelling)
1Then came together vnto him the Pharises, and certain of the Scribes, which came from Hierusalem.
2And when they saw some of his disciples eate bread with defiled (that is to say, with vnwashen) hands, they found fault.
3For the Pharises and all the Iewes, except they wash their hands oft, eate not, holding the tradition of the elders.
4And when they come from the market, except they wash, they eate not. And many other things there be, which they haue receiued to hold, as the washing of cups and pots, brasen vessels, and of tables.
5Then the Pharises and Scribes asked him, Why walke not thy disciples according to the tradition of the Elders, but eate bread with vnwashen hands?
6He answered and said vnto them, Well hath Esaias prophesied of you Hypocrites, as it is written, This people honoureth mee with their lips, but their heart is farre from me.
7Howbeit in vaine doe they worship me, teaching for doctrines, the commandements of men.
8For laying aside the Commandement of God, yee hold the tradition of men, as the washing of pots, and cups: and many other such like things ye doe.
9And he said vnto them, Full well ye reiect the Commandement of God, that ye may keepe your owne tradition.
10For Moses said, Honour thy father & thy mother: and who so curseth father or mother, let him die the death.
11But ye say, If a man shall say to his father or mother, It is Corban, that is to say, a gift, by whatsoeuer thou mightest be profited by me: he shalbe free.
12And ye suffer him no more to doe ought for his father, or his mother:
13Making the word of God of none effect through your tradition, which ye haue deliuered: And many such like things doe ye.
14¶ And when he had called all the people vnto him, hee said vnto them, Hearken vnto me euery one of you, and vnderstand.
15There is nothing from without a man that entring into him, can defile him: but the things which come out of of him, those are they that defile the man.
16If any man haue eares to heare, let him heare.
17And when hee was entred into the house from the people, his disciples asked him concerning the parable.
18And he saith vnto them, Are ye so without vnderstanding also? Doe yee not perceiue that whatsoeuer thing from without entreth into the man, it cannot defile him,
19Because it entreth not into his heart, but into the belly, and goeth out into the draught, purging all meats?
20And he said, That which commeth out of the man, that defileth the man.
21For from within, out of the heart of men, proceed euill thoughts, adulteries, fornications, murders,
22Thefts, couetousnesse, wickednesse, deceit, lasciuiousnesse, an euill eye, blasphemie, pride, foolishnesse:
23All these euill things come from within, and defile the man.