John 7:22

Moses gave you circumcision. Not that it is of Moses, but of the fathers. And you circumcise a man on the Sabbath.

Leviticus 12:3

The boy must be circumcised when he is eight days old.

Genesis 17:10-14

This is my covenant with you and your descendants after you, the covenant you are to keep: Every male among you shall be circumcised.

Romans 4:9-11

Is this blessing then pronounced upon the circumcised only, or upon the uncircumcised also? For we say: To Abraham his faith was counted for righteousness.

Galatians 3:17

Now this I say: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify 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 with you and your descendants after you, the covenant you are to keep: Every male among you shall be circumcised.
Leviticus 12:3
The boy must be circumcised when he is eight days old.
Romans 4:9
Is this blessing then pronounced upon the circumcised only, or upon the uncircumcised also? For we say: To Abraham his faith was counted for righteousness.
Galatians 3:17
Now this I say: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify the promise.

General references

Genesis 21:4
When his son Isaac was eight days old, Abraham circumcised him as God had commanded him.
Leviticus 12:3
The boy must be circumcised when he is eight days old.
John 9:14
Jesus healed the blind man on the Sabbath day.