John Calvin Commentary John 7:22

"Moses hath given you circumcision (not that it is of Moses, but of the fathers); and on the sabbath ye circumcise a man." — John 7:22 (ASV)

Therefore Moses gave you circumcision. The particle therefore appears to be unsuitable; and, accordingly, some take διὰ τοῦτο (on this account, or therefore) in the sense of διὰ τοῦτο, (because), but the Greek syntax is unfavourable to their opinion. I explain it simply as meaning that circumcision was enjoined in such a manner that the practice of that symbolic rite was necessary even on the Sabbath-day.

Therefore, he says, that is, it has in this manner been sufficiently demonstrated to them that the worship of the Sabbath is not violated by the works of God. And although Christ applies the example of circumcision to the present subject, he immediately makes a correction when he says that Moses was not the first minister of circumcision. But it was enough for his purpose that Moses, who so rigidly demanded the keeping of the Sabbath, commanded that infants should be circumcised on the eighth day, even though it should fall on the day of Rest.