Genesis 17:2 - Ellicott's Commentary On The Whole Bible

I will make my covenant. — In Genesis 15:18 the Heb. word for “make” is cut, and refers to the severing of the victims; here it is “give,” “place,” and implies that it was an act of grace on God’s part (comp. Note on Genesis 9:9). Abram had now waited twenty-five years after leaving Ur-Chasdim, and fourteen or fifteen years since the ratification of the solemn covenant between him and Jehovah (Genesis 15:17); but the time had at length arrived for the fulfilment of the promise, and in token thereof Abram and Sarai were to change their names, and all the males be brought near to God by a solemn sacrament.