Genesis 17:11

Overview - Genesis 17
God renews the covenant with Abram, and changes his name to Abraham, in token of a greater blessing.
Circumcision is instituted.
15 Sarai's name is changed to Sarah, and she is blessed.
17 Isaac is promised, and the time of his birth fixed.
23 Abraham and Ishmael are circumcised.
Treasury of Scripture Knowledge

Genesis 17:11  (King James Version)
And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.

the flesh
Exodus 4:25 ; Joshua 5:3 ; 1 Samuel 18:25-27 ; 2 Samuel 3:14

a token
Acts 7:8 ; Romans 4:11