Genesis 17:9

Then God said to Abraham, 'As for you, you must keep my covenant, you and your descendants after you for the generations to come.

(New International Version)

God said further to Abraham, 'Now as for you, you shall keep My covenant, you and your descendants after you throughout their generations.

(New American Standard Bible)

And God said unto Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations.

(King James Version)