'Observe' in the Bible

The statutes and the ordinances and the law and the commandment which He wrote for you [by the hand of Moses], you shall observe and do forever. You shall not fear (worship, serve) other gods.

And I will not make the feet of Israel wander anymore from the land which I gave their fathers, if only they will be careful to act in accordance with everything that I have commanded them, and with all the law that My servant Moses commanded them.”