Genesis 17:12

3. Further, they declare that the arrangement made with respect to the ark in the Deluge, by means of which eight persons were saved, most clearly indicates the Ogdoad which brings salvation. David also shows forth the same, as holding the eighth place in point of age among his brethren. Moreover, that circumcision which took place on the eighth day, represented the circumcision of the Ogdoad above. In a word, whatever they find in the Scriptures capable of being referred to the number eight , they declare to fulfil the mystery of the Ogdoad. With respect, again, to the Decad, they maintain that it is indicated by those ten nations which God promised to Abraham for a possession. The arrangement also made by Sarah when, after ten years, she gave her handmaid Hagar to him, that by her he might have a son, showed the same thing. …

6. The next verse too is suspicious, "If ye believed Moses, ye would also believe me;" for the religion of Moses is so entirely different from that of Christ, that if the Jews believed one, they could not believe the other. Moses strictly forbids any work to be done on Sabbath, and gives as a reason for this prohibition that God made the world and all that is therein in six days, and rested on the seventh day, which is Sabbath; and therefore blessed or sanctified it as His haven of repose after toil, and commanded that breaking the Sabbath should be punished with death. The Jews, in obedience to Moses, insisted strongly on this, and so would not even listen to Christ when He told them that God always works, and that no day is appointed for the intermission of His pure and unwearied energy, and that accordingly He Himself had to work incessantly even on Sabbath. …

3. To return to what I said of your not accepting everything in the Old Testament. You do not admit carnal circumcision, though that is what is written; nor resting from all occupation on the Sabbath, though that is enjoined; and instead of propitiating God, as Moses recommends, by offerings and sacrifices, you cast these things aside as utterly out of keeping with Christian worship, and as having nothing at all to recommend them. In some cases, however, you make a division, and while you accept one part, you reject the other. Thus, in the Passover, which is also the annual feast of the Old Testament, while it is written that in this observance you must slay a lamb to be eaten in the evening, and that you must abstain from leaven for seven days, and be content with unleavened bread and bitter herbs, you accept the feast, but pay no attention to the rules for its observance. …

Chapter 24. 32. And if any one seek for divine authority in this matter, though what is held by the whole Church, and that not as instituted by Councils, but as a matter of invariable custom, is rightly held to have been handed down by apostolical authority, still we can form a true conjecture of the value of the sacrament of baptism in the case of infants, from the parallel of circumcision, which was received by God’s earlier people, and before receiving which Abraham was justified, as Cornelius also was enriched with the gift of the Holy Spirit before he was baptized. …

So far, indeed, as I in my ignorance know, to begin with inferior and more dense things, God, knowing the denseness of the Israelites and their carnal love and propensity towards matter in everything, made this law: first, in order that the servant and the cattle should rest as it is written, for the righteous man regardeth the life of his beast : next, in order that when they take their ease from the distraction of material things, they may gather together unto God, spending the whole of the seventh day in psalms and hymns and spiritual songs and the study of the divine Scriptures and resting in God. For when the law did not exist and there was no divinely-inspired Scripture, the Sabbath was not consecrated to God. …