When was the law given to Israel relative to Abraham?
The law was given to Israel approximately 500 years after Abraham, or 490 years to be exact. Abraham was called out of Ur around 2,000 B.C., and Moses led Israel out of Egypt and God gave the law around 1,500 B.C. From that giving until Christ was about 1,500 years.
Les explains that Abraham was called out of Ur at 2,000 B.C., and 500 years later—490 if you want to be exact—Moses led Israel out of Egypt and God gave the law. So the law came about 1,500 B.C., and Israel labored under that yoke of bondage for 1,500 years until the time of Christ at zero. Les notes this long period under legalism contributed to their rank unbelief.