As Jesus was coming out to the road, a man came running to him and knelt in front of him. He asked Jesus, “Good Teacher, what should I do to inherit eternal life?”
One of the experts in Moses’ Teachings went to Jesus during the argument with the Sadducees. He saw how well Jesus answered them, so he asked him, “Which commandment is the most important of them all?”
If we have to gain the inheritance by following those laws, then it no longer comes to us because of the promise. However, God freely gave the inheritance to Abraham through a promise.