'Observes' in the Bible

where I gave them my statutes and revealed my ordinances to them, which if a person observes, he'll live by them.

"But the house of Israel rebelled against me in the wilderness. They didn't live by my statutes. They despised my ordinances, which if a person observes, he'll live by them. They greatly profaned my Sabbaths. So I said I would pour out my anger on them and bring them to an end in the wilderness.