Gen 22:1-2
Some time later God tested Abraham. He said to him, "Abraham!" "Here I am," he replied. Then God said, "Take your son, your only son, Isaac, whom you love, and go to the region of Moriah. Sacrifice him there as a burnt offering on one of the mountains I will tell you about."

God told Abraham to take his ONLY son. Even though Abraham had another son, Ishmael, by Hagar, Isaac was the son of promise.

Notice all the parallels to Jesus in the sacrificing of Isaac. It was a three day journey for Abraham and Isaac. It was a three day journey for Jesus from the cross to the resurrection. Isaac carried the wood for the sacrifice. Jesus carried the wooden cross for His sacrifice. Isaac submitted to the will of his father. Jesus submitted to the will of His Father. Isaac was saved by the substitution of another sacrifice. We are saved by the sacrifice of Jesus. The place of Isaac's near sacrifice was Mount Moriah, the same place that Solomon built the temple (2 Chron 3:1), and the same place Jesus was crucified, Jerusalem.

Who was the “angel of the Lord” with Abraham and Isaac? Sounds a lot like the Son of God. Look at the blessings and promises given to Abraham. Only God can make those promises.