What does Genesis 22:19 mean?

This is the final verse in the story of Abraham's obedience in his willingness to sacrifice his only son at God's command. Abraham has seen God's goodness proven over and over, so he trusts that God has some good outcome in mind. And, as expected, God intervenes to stop Isaac from being harmed, while providing an animal sacrifice (Genesis 22:11–13). When the ritual is completed, Abraham and Isaac go back down the mountain, to meet Abraham's two servants. The small company travels together back to Abraham's home in Beersheba.

Though Abraham might not have known exactly what would happen when he left these two servants to go up the mountain, he was right: "I and the boy will go over there and worship and come again to you" (Genesis 22:5).