'Promise' in the Bible

So her husband Elkanah said to her, "Do what you think best. Stay until you have weaned him. May the Lord fulfill his promise." So the woman stayed and nursed her son until she had weaned him.

Therefore the Lord God of Israel declares, ‘I did indeed say that your house and that of [Aaron] your father would walk [in priestly service] before Me forever.’ But now the Lord declares, ‘Far be it from Me—for those who honor Me I will honor, and those who despise Me will be insignificant and contemptible.

I'll fulfill every promise that I've spoken concerning Eli's family, from beginning to end.