Before we delve into the quotations, remember that the Patristic era ended well before the Council of Vienne, which first dogmatically defined that there was no salvation without the sacrament of Baptism, therefore any Fathers who thought contrary were not heretics, but merely erroneous. This principle was authoritatively put forth by Sixtus IV:
St. Aphraates, Treatises, 6:14:4, AD 340: "From baptism we receive the Spirit of rist. At that same moment in which the priests invoke the Spirit, heaven opens, and he descends and rests upon the waters, and those who are baptized are clothed in him. The Spirit is absent from all those who are born of the flesh, until they come to the water of rebirth, and then they receive the Holy Spirit. . . . [I]n the second birth, that through baptism, they receive the Holy Spirit"