And I will make my covenant between me and thee. Literally, I will give (cf. Genesis 9:9, Genesis 9:11, Genesis 9:12). Neither an additional covenant to that described in Genesis 15:1-21. (Rosenmüller), nor a different traditional account of the transaction contained in Genesis 15:1-21.
(Tuch, Bleek), nor the original Elohistic narrative of which that in Genesis 15:1-21. was a later imitation (Knobel); but an intimation that the covenant already concluded was about to be carried into execution, and the promise of a son to be more specifically determined as the offspring of Sarai (Keil).
And will multiply thee exceedingly (vide Genesis 12:2; Genesis 13:16; Genesis 15:5).