If people looked at the writings of Paul they would see the law was added. So that says there must have been something for it to be added to. That would be grace. If as the Word says Abraham was a man who obeyed all Gods laws and commandments, so what were those laws. There were none written down. We know he heard God and obeyed. Faith comes by hearing and hearing by the Word of God. There is lot one can learn from studying the father of all nations in regards to this law and grace issue. To much for me to write here that I have learnt. His interaction with Melchezidek, the king of peace, a priest and a king, who shared bread and wine with Abraham, and who Abraham tithed to. Jesus of course being a priest and a king after the order of Melchezidek. And as Jesus said not one jot or tittle of the law shall pass away then told us the whole of the law hangs under two commandments love God and love your brother. Then He said He came to fulfill the law by being the only one and only acceptable sacrifice. Remembering of course after He died and Ascended the temple was destroyed so there was no where for the Israelites to sacrifice animals anymore. We are not bound by the law that was given to the Israelite nation, we are of course under the grace that has always existed.