The Greek word in Matthew 3:7 is not the same one Christ used in Matthew 23 and 24 (among others). The word He used in Matthew 3:7 is this:
Greek NASB Number: 1081
Greek Word: γέννημα
Transliterated Word: gennêma
Root: from
1080;
Definition: offspring:--
List of English Words and Number of Times Used
brood (4).
,
New American Standard Exhaustive Concordance of the Bible, (Anaheim, CA: Foundation Publications, 1998), WORD
search CROSS e-book, Under: "1081".
The word He used in Matthew 23 and 24 is this:
Greek NASB Number: 1074
Greek Word: γενεά
Transliterated Word: genea
Root: from
1096;
Definition: race, family, generation:--
List of English Words and Number of Times Used
generation (32),
generations (10),
kind (1).
,
New American Standard Exhaustive Concordance of the Bible, (Anaheim, CA: Foundation Publications, 1998), WORD
search CROSS e-book, Under: "1074".
Note that this word is used 43 times in the NT and only once does it
not refer to a group of people living at the same time.
In Matthew 23, it is clearly referring to the generation of those He was addressing:
"Therefore, behold, I am sending you prophets and wise men and scribes; some of them you will kill and crucify, and some of them you will scourge in your synagogues, and persecute from city to city,
so that upon you may fall the guilt of all the righteous blood shed on earth, from the blood of righteous Abel to the blood of Zechariah, the son of Berechiah, whom you murdered between the temple and the altar.
"Truly I say to you, all these things will come upon this generation.
"Jerusalem, Jerusalem, who kills the prophets and stones those who are sent to her! How often I wanted to gather your children together, the way a hen gathers her chicks under her wings, and you were unwilling.
"Behold, your house is being left to you desolate! Matthew 23:34-38 (NASB)
It means the same thing in Matthew 24:
"Now learn the parable from the fig tree: when its branch has already become tender and puts forth its leaves, you know that summer is near; so, you too, when you see all these things, recognize that He is near,
right at the door. "Truly I say to you,
this generation will not pass away until all these things take place. Matthew 24:32-34 (NASB)
Eusebius understood Christ's use of this word to mean those living at the time when He spoke those words:
But the rest of the apostles who were harassed in innumerable ways, with a view to destroy them [see the quote from Matthew 23 above],
and driven from the land of Judea, had gone forth to preach the gospel to all nations, relying upon the aid of Christ, when he said, "Go ye, teach all nations in my name."
The whole body, however, of the church at Jerusalem, having been commanded by a divine revelation, given to men of approved piety there before the war, removed from the city, and dwelt at a certain town beyond the Jordan, called Pella [see Matthew 24:15].
Here, those that believed in Christ, having removed from Jerusalem, as if holy men had entirely abandoned the royal city itself, and the whole land of Judea; the divine justice, for their crimes against Christ and his apostles, finally overtook them, totally destroying the whole generation of these evildoers from the earth.
But the number of calamities which then overwhelmed the whole nation; the extreme misery to which particularly the inhabitants of Judea were reduced, the vast numbers of men, with women and children that fell by the sword and famine, and innumerable other forms of death; the numerous and great cities of Judea that were besieged, as also the great and incredible distresses that those experienced who took refuge at Jerusalem, as to a place of perfect security; these facts, as well as the whole tenor of the war, and each particular of its progress, when finally, the abomination of desolation, according to the prophetic declaration, stood in the very temple of God, so celebrated of old, but which now was approaching its total down-fall and final destruction by fire; all this, I say, any one that wishes may see accurately stated in the history written by Josephus.
It may, however, be necessary to state, in the very words of this writer, how about three hundred thousand that flocked from all parts of Judea at the time of the passover, were shut up in Jerusalem as in a prison. For it was indeed just, that in those very days in which they had inflicted sufferings upon the Saviour and benefactor of all men, the Christ of God, destruction should overtake them, thus shut up as in a prison, as an exhibition of the divine justice.
Passing by, then, the particular calamities which befell them, such as they suffered from the sword, and other means employed against them, I may deem it sufficient only to subjoin the calamities they endured from the famine.
So that they who peruse the present history, may know in some measure, that the divine vengeance did not long delay to visit them for their iniquity against the Christ of God.
Eusebius Pamphilus, The Ecclesiastical History of Eusebius Pamphilus, WORDsearch CROSS e-book, 85-87.
The blood of the prophets and those Christ sent was held against
that generation, just as He said it would.
Everything else in the Olivet Discourse revolves around the fulfillment of His words "this generation" by these events.