John Calvin says, “God, after speaking, immediately wants to ratify His promises in a way that seems good to Him.”
This is one reason we have communion right after the sermon. Word and sacrament need to be together. This meal is your rainbow, a promise that God will preserve you to the end. No flood waters can separate you from God. Wild horses can’t drag you away from the Lord Christ.
This is your sign that God has remembered you, and it is the way God has given you to remember him.