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TERTULLIAN
“Happy is our sacrament of water, in that, by washing away the sins of our early blindness, we are set free and admitted into eternal life. . . . [But] a viper of the [Gnostic] Cainite heresy, lately conversant in this quarter, has carried away a great number with her most venomous doctrine, making it her first aim to destroy baptism—which is quite in accordance with nature, for vipers and.asps . . . themselves generally do live in arid and waterless places. But we, little fishes after the example of our [Great] Fish, Jesus Christ, are born in water, nor have we safety in any other way than by permanently abiding in water. So that most monstrous creature, who had no right to teach even sound doctrine, knew full well how to kill the little fishes—by taking them away from the water!” (Baptism 1 [A.D. 203]).
“Without baptism, salvation is attainable by none” (ibid., 12).
ORIGEN
“It is not possible to receive forgiveness of sins without baptism” (Exhortation to the Martyrs 30 [A.D. 235]).
CYRIL OF JERUSALEM
“If any man does not receive baptism, he does not have salvation.
St. AUGUSTINE
“There are three ways in which sins are forgiven: in baptism, in prayer, and in the greater humility of penance; yet God does not forgive sins except to the baptized” (Sermons to Catechumens on the Creed 7:15 [A.D. 395]).
POPE LEO I
“And because of the transgression of the first man, the whole stock of the human race was tainted; no one can be set free from the state of the old Adam save through Christ’s sacrament of baptism, in which there are no distinctions between the reborn, as the apostle [Paul] says, ‘For as many of you as were baptized in Christ did put on Christ; there is neither Jew nor Greek . . . ‘ [Gal. 3:27–28]” (Letters 15:10[11] [A.D. 445]).
FULGENTIUS OF RUSPE
“From that time at which our Savior said, ‘If anyone is not reborn of water and the Spirit, he cannot enter into the kingdom of heaven’ [John 3:5], no one can, without the sacrament of baptism, except those who, in the Catholic Church, without baptism, pour out their blood for Christ, receive the kingdom of heaven and life eternal” (The Rule of Faith 43 [A.D. 524]).
Irenaeus
He [Jesus] came to save all through himself – all, I say, who through him are reborn in God; INFANTS, and children, and youths, and old men. Therefore he passed through every age, becoming an INFANT for INFANTS, sanctifying INFANTS; a child for children, sanctifying those who are of that age . . . [so that] he might be the perfect teacher in all things, perfect not only in respect to the setting forth of truth, perfect also in respect to relative age (Against Heresies 2:22:4 [A.D. 189]).
Hippolytus
Baptize first the children, and if they can speak for themselves let them do so. Otherwise, let their parents or other relatives speak for them (The Apostolic Tradition 21:16 [A.D.215]).
Origen
THE CHURCH RECEIVED FROM THE APOSTLES the tradition of giving baptism even to infants. The APOSTLES, to whom were committed the secrets of divine sacraments, knew there is in everyone innate strains of [original] sin, which must be washed away through water and the Spirit (Commentaries on Romans 5:9 [A.D. 248]).
Cyprian
As to what pertains to the case of INFANTS: You [Fidus] said that they ought not to be baptized within the second or third day after their birth, that the old law of circumcision must be taken into consideration, and that you did not think that one should be baptized and sanctified within the eighth day after his birth. In our council it seemed to us far otherwise. No one agreed to the course which you thought should be taken. Rather, we all judge that the mercy and grace of God ought to be denied to no man born" (Letters 64:2 [A.D. 253]).
Augustine
It is this one Spirit who makes it possible for an infant to be regenerated . . . when that INFANT is brought to baptism; and it is through this one Spirit that the infant so presented is reborn. For it is not written, "Unless a man be born again by the will of his parents" or "by the faith of those presenting him or ministering to him," but, "Unless a man be born again of water and the Holy Spirit." The water, therefore, manifesting exteriorly the sacrament of grace, and the Spirit effecting interiorly the benefit of grace, both regenerate in one Christ that man who was generated in Adam (Letters 98:2 [A.D. 408]).
Baptism is Necessary for salvation
Irenaeus (120?-200), “’And dipped himself,’ says [the Scripture], ‘seven times in Jordan.’ It was not for nothing that Naaman of old, when suffering from leprosy, was purified upon his being baptized, but it served as an indication to us. For as we are lepers in sin, we are made clean, by means of the sacred water and the invocation of the Lord, from our old transgressions; being spiritually regenerated as new-born babes, even as the Lord has declared: ‘Except a man be born again through water and the Spirit, he shall not enter into the kingdom of heaven.'” (Fragment, 34, A.D. 190).
Origen (185-254), “The Church received from the Apostles the tradition of giving Baptism even to infants. For the Apostles, to whom were committed the secrets of divine mysteries, knew that there is in everyone the innate stains of sins, which must be washed away through water and the Spirit.” (Origen, Commentary on Romans, 5:9)
Tertullian (155-220), “When, however, the prescript is laid down that ‘without baptism, salvation is attainable by none” (chiefly on the ground of that declaration of the Lord, who says, “Unless one be born of water, he hath not life.'” (On Baptism, 12:1, A.D. 203).
Ambrose (340?-397), “The Church was redeemed at the price of Christ’s blood. Jew or Greek, it makes no difference; but if he has believed, he must circumcise himself from his sins [in baptism (Col. 2:11-12)] so that he can be saved . . . for no one ascends into the kingdom of heaven except through the sacrament of baptism . . . “Unless a man be born again of water and the Holy Spirit, he cannot enter the kingdom of God” (On Abraham 2:11:79-84).WATER AND SPIRIT, NOT SPIRIT ONLY, NOT WATER ONLY.1 JOHN 5:8 shows the witnesses on earth SPIRIT, WATER AND BLOOD, you have none of them.