Chapter 21 can feel rather anticlimactic. God made promises to Abraham and here we see those promises fulfilled. We expected it. Especially if we have an understanding of God based on the Bible. God is faithful. But this is a huge moment in Salvation History. This is the first moment of this sort along the way towards Christ, the cross and the Gospel message. God will continue to promise His people things and He will continue to deliver. We have come to expect it because it always happens. We can bank on God’s promises. But, again, this is a first.
Perhaps more interesting here is the fact that God shows Himself to be faithful in ALL His word. Yes, Isaac is the intended fulfillment of God’s plan and covenant, but God will be faithful to Ishmael as well. God cares about all of the individuals in His creation, even the “fringe” characters in life. He is not just the God of the key figures in His plan.
How often has God been faithful to people throughout history, even those who did not play a major part in Salvation History? Ones we will likely never know about? Always. That too we can bank on. God has so much more going on in His plans for creation than we read about in scripture or experience personally. Namely, He is involved in or offers to be involved in every single person’s life. We know too that He won’t force His way on the unwilling, and that He will allow people’s sin to be thoroughly punished. But He is there for all who turn to Him.