John 7:22

because of this, Moses hath given you the circumcision -- not that it is of Moses, but of the fathers -- and on a sabbath ye circumcise a man;

Leviticus 12:3

and in the eighth day is the flesh of his foreskin circumcised;

Genesis 17:10-14

this is My covenant which ye keep between Me and you, and thy seed after thee: Every male of you is to be circumcised;

Romans 4:9-11

Is this happiness, then, upon the circumcision, or also upon the uncircumcision -- for we say that the faith was reckoned to Abraham -- to righteousness?

Galatians 3:17

and this I say, A covenant confirmed before by God to Christ, the law, that came four hundred and thirty years after, doth not set aside, to make void the promise,

Treasury of Scripture Knowledge

Summary

Moses therefore gave unto you circumcision; (not because it is of Moses, but of the fathers;) and ye on the sabbath day circumcise a man.

Bible References

Circumcision

Genesis 17:10
this is My covenant which ye keep between Me and you, and thy seed after thee: Every male of you is to be circumcised;
Leviticus 12:3
and in the eighth day is the flesh of his foreskin circumcised;
Romans 4:9
Is this happiness, then, upon the circumcision, or also upon the uncircumcision -- for we say that the faith was reckoned to Abraham -- to righteousness?
Galatians 3:17
and this I say, A covenant confirmed before by God to Christ, the law, that came four hundred and thirty years after, doth not set aside, to make void the promise,

General references

Genesis 21:4
and Abraham circumciseth Isaac his son, being a son of eight days, as God hath commanded him.
Leviticus 12:3
and in the eighth day is the flesh of his foreskin circumcised;
John 9:14
and it was a sabbath when Jesus made the clay, and opened his eyes.