The number 10 is a number of testing. How many virgins were there? How many times were the children testes? How many talents were given? After the testing comes the Blessing. We are owners of NOTHING in this earth, we are ONLY STEWARDS of it. Even money. Money belongs to GOD. When we tithe, we are only giving Him back what is already his. Abraham knew that his son did not belong to him, he belonged to GOD. God tested him to see if he understood this. He was being tested to see if Abraham loved the possession more than he loved him. If God ask you to give it, HE KNOWS YOU WILL. After the testing of Abraham, God Blessed him.