John Gills Exposition of the Bible Commentary - Genesis 22:15
And the Angel of the Lord called unto Abraham out of heaven the second time. The Angel having restrained him from slaying his son, and having provided another sacrifice, which he offered, calls to him again; having something more to say to him, which was to renew the covenant he had made with him, and confirm it by an oath. read more
Matthew Henry's Complete Commentary - Genesis 22:15-19
Abraham's obedience was graciously accepted; but this was not all: here we have it recompensed, abundantly recompensed, before he stirred from the place; probably while the ram he had sacrificed was yet burning God sent him this gracious message, renewed and ratified his covenant with him. All covenants were made by sacrifice, so was this by the typical sacrifices of Isaac and the ram. Very high expressions of God's favour to Abraham are employed in this confirmation of the covenant with him,... read more