An expert in the Law of Moses stood up and asked Jesus a question to see what he would say. “Teacher,” he asked, “what must I do to have eternal life?”
One of the teachers of the Law of Moses came up while Jesus and the Sadducees were arguing. When he heard Jesus give a good answer, he asked him, “What is the most important commandment?”
They asked Jesus this question, because they wanted to test him and bring some charge against him. But Jesus simply bent over and started writing on the ground with his finger.
If we have to obey the Law in order to receive God's blessings, those blessings don't really come to us because of God's promise. But God was kind to Abraham and made him a promise.