Did Abraham Keep 613 Commandments of Moses Law

Did Abraham Keep 613 Commandments of Moses' Law? Moses lived about 400 years after Abraham and did not receive Torah in the days of Abraham.

Some believe he did, imposing the Seventh Day Sabbath on Christians.

Secondly, Moses, also stated that the law God made with Israel (who had not become a nation until the Exodus and Canaan) was not made with "their fathers" but only with those who were alive that day. See Deut. 4:1-2; 5:1-2.