'To the Lord' in the Bible

He who observes the day, observes it to the Lord; and he who does not observe the day, to the Lord he does not observe it. He who eats, eats to the Lord, for he gives God thanks. He who doesn't eat, to the Lord he doesn't eat, and gives God thanks.

For if we live, we live to the Lord. Or if we die, we die to the Lord. If therefore we live or die, we are the Lord's.