Exodus 12:27-28 That ye shall say, It is the sacrifice of the Lord’s passover, who passed over the houses of the children of Israel in Egypt, when he smote the Egyptians, and delivered our houses. And the people bowed the head and worshipped. And the children of Israel went away, and did as the Lord had commanded Moses and Aaron, so did they.
The Lord God was going to work a great miracle of Deliverance that night: Judgment on Egypt and their gods, Salvation for Israel by their God. The Destroyer would come through the land and kill the firstborn of every household and of the cattle. But Israel was commanded to sacrifice a lamb and sprinkle the doorposts of the house and celebrate a Feast. The Destroyer would pass over that house and not kill.
The people responded in faith, and did as commanded. They bowed the head and worshipped. They bowed the head in humble reverence to the Lord and trusting surrender to His glory and power, and to His word. They worshipped the only true God with praise and thanks for His goodness and mercy, grace and salvation. They hadn’t seen the passing over yet, but they obeyed in faith.
The whole sacrifice, ritual, and meal was a believing response to God’s promise of Deliverance. And the people obeyed and did because they believed God. We respond the same way every Sunday when we hear the Gospel, praise and worship, and celebrate the Holy Meal. Then because we remember what God did to save us and trusting what He will do, we are made glad to obey and do His commands. And life is good!