Genesis 21:4

And Abraham circumcised his son Isaac being eight days old, as God had commanded him.

(Geneva Bible) - Then Abraham circumcised Isaac his son, when he was eight days old, (*) as
God had commanded him.
(*) Genesis 17:12 .

2nd Thessalonians 3:10

For even when we were with you, this we commanded you, that if any would not work, neither should he eat.