From epi and the base of aggelos; to announce upon (reflexively), i.e. (by implication) to engage to do something, to assert something respecting oneself -- profess, (make) promise.
KJV: And he gave him none inheritance in it, no, not so much as to set his foot on: yet he promised that he would give it to him for a possession, and to his seed after him, when as yet he had no child.
NASB: "But He gave him no inheritance in it, not even a foot of ground, and yet, even when he had no child, He promised that HE WOULD GIVE IT TO HIM AS A POSSESSION, AND TO HIS DESCENDANTS AFTER HIM.
KJV: Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made;and it was ordained by angels in the hand of a mediator.
NASB: Why the Law then? It was added because of transgressions, having been ordained through angels by the agency of a mediator, until the seed would come to whom the promise had been made.