God had promised His hungry people that He would rain down bread from heaven. When the Israelites looked outside in the morning, and saw what God had prepared for them, they asked, "What is it?" Moses then told them what it was and what to do with it. God has given us a miraculous meal in the Lord's Supper. And a good question to ask as, we go up to the altar to receive it is, is also this same question: "What is it?" God tells us what it is and what we are to do with it.