Moses therefore gave unto you circumcision; (not because it is of Moses, but of the fathers;) and you on the sabbath day circumcise a man.
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Cornelius a Lapide
AD 1637
For this cause Moses, &c. (1.) Some, as Theophylact and Maldonatus, connect this with the preceding verse, "Ye all marvel at this My healing on the Sabbath." (2.) Euthymius and Jansen explain thus, "To keep you from wondering, just consider what I am going to say about circumcision."
(3.) S. Cyril, Toletus and F. Lucas explain it thus: "Though Moses gave you circumcision, it was because he wished studiously to observe the tradition of the fathers, and yet on the Sabbath day, which Moses also authorised, ye circumcise a man. (4.) It is on account of the surprise you feel that I add an argument from the rite of circumcision, which ye perform by Moses" own order on the Sabbath.
Not because it is of Moses, but of the fathers. The patriarch Abraham, and not Moses, instituted circumcision. And he adds this to teach them not to rely to such an extent on the law of Moses alone, respecting the Sabbath, or to neglect the laws of those who preceded him. But on the other hand, if those earlier laws are at variance with the law of Moses, the elder laws should prevail and the law of Moses give way to them. And, thus, the law of circumcision given to Abraham cancelled the law of the Sabbath given to Moses, that if a child were born on the Sabbath, he was obliged to be circumcised precisely on the eighth day, and that his circumcision could not possibly be deferred to the day following. If then the law of Moses was obliged to give way to the law of Abraham, much more should it give way to the Law of Christ and God, which orders us to do good, if we can, to the sore afflicted, even on the Sabbath, more especially if we do so quickly, and in a word, as Christ did. And ye on the Sabbath day circumcise a man. And, i.e, therefore, because the law of circumcision was anterior, and given to Abraham by God, it overrules the Sabbath, which was instituted afterwards by Moses at the command of God. And therefore, if the eighth day from the child"s birth is the Sabbath, ye circumcise him with great preparation and trouble, that the law of God given to Abraham may be kept.