God heard the voice of the boy

Genesis 21:1-34
Abraham was a hundred years old when his son Isaac was born to him.
God heard the voice of the boy where he is, God open Hagar' eyes, and she saw a well of water. God was with the boy, and he grew up.
Abimelech made treaty with Abraham for God is with Abraham in all that he does.
They made a covenant at Beersheba. Abraham planted a tamarisk tree in Beeshebba and called there the name of the Lord.Twenty-five years have passed since the promise was first made. Isaac's elderly parents are naturally overjoyed at hisbirth.
Why?
Sarah's demand that Hagar and Ishmael be sent away runs counter to custom, and Abraham needs a word from God before he will agree.
Galatians 4:22 shows why the rift was inevitable. God's care for Ishmael, although he was not the child of the promise, once more shines through. Outcast by Sarah and Abraham, he is not cast out by God. On the contrary, God was with the child as he grew up.
Water has always been precious to the herdsmen in the dry climate of southern Palestine.. Monthly rainfall in this area drops from 100mm/4ins in January to nothing at all in the four summer months.
So Abraham's dispute over the well at Beersheba is not surprising. Abimelech may be a Philistine title for 'king', rather than a personal name.
Abraham listened the word of God when this dispute rose in his home between two women.
How?
Abrahma chose listen to the word of God then obey it, God is love Abraham and Ishmael, so God loves us either.