'Appear Before Me' in the Bible

You are to observe the Festival of Unleavened Bread. As I commanded you, you are to eat unleavened bread for seven days at the appointed time in the month Abib, because in it you came out of Egypt. No one is to appear before me empty handed.

You are to redeem the firstborn of a donkey with a sheep, and if you don't redeem it, you are to break its neck. You are to redeem every firstborn of your sons, and no one is to appear before me empty-handed.