15 Then the angel of the LORD called to Abraham a second time from heaven, 16 and said, “By Myself I have sworn, declares the LORD, because you have done this thing and have not withheld your son, your only son, 17indeed I will greatly bless you, and I will greatly multiply your seed as the stars of the heavens and as the sand which is on the seashore; and your seed shall possess the gate of their enemies. 18 “In your seed all the nations of the earth shall be blessed, because you have obeyed My voice.” 19 So Abraham returned to his young men, and they arose and went together to Beersheba; and Abraham lived at Beersheba.
20 Now it came about after these things, that it was told Abraham, saying, “Behold, Milcah also has borne children to your brother Nahor: 21 Uz his firstborn and Buz his brother and Kemuel the father of Aram 22 and Chesed and Hazo and Pildash and Jidlaph and Bethuel.” 23 Bethuel became the father of Rebekah; these eight Milcah bore to Nahor, Abraham’s brother. 24 His concubine, whose name was Reumah, also bore Tebah and Gaham and Tahash and Maacah.
So Abraham passes the test, and the result is? God will bless him even and multiply his descendants. Wait, isn’t that what God had already promised? Yes it is, but now Abraham had sealed his part of the covenant. Not only did he bear the mark of circumcision, but now he had held nothing back from God. God knew now that Abraham was devoted to Him. When God wants to bless us, it doesn’t come for free. He wants to know that He has our full devotion, that nothing in our lives is as important as He is. Only then can God bless us like He wants to.