Nehemiah 9:5b-6 – Stand up and bless the Lord your God from everlasting to everlasting. Blessed be your glorious name, which is exalted above all blessing and praise. You are the Lord, you alone. You have made heaven, the heaven of heavens, with all their host, the earth and all that is on it, the seas and all that is in them; and you preserve all of them; and the host of heaven worships you.
Why worship the Lord? Here, as we see a congregational prayer in Israel after the walls of Jerusalem were built, we see a great starter reason. Worship the Lord, for he has made and sustains all things.
God is the only God. The Lord is the only God over all. Only the Lord created the heavens, the earth, and the seas. This is saying that God made everything there is, everything you can think of. God made the sky and all in the sky. God made the land and all that is on or under the land. God made the seas and everything within. There is no part of the entire universe that God did not create by his mighty power, out of nothing, for his glory. Thus, there is no part of this universe that does not belong to our God.
Not only did God create all things, he sustains all things. If God were to remove his power, the universe would disappear in an instant. Nothing we think is solid could remain without God empowering it to do so. God is necessary, not only for the beginning of creation, but for the continuing existence of all things.
Indeed, as the prayer begins, blessed be our God! Blessed be his name. Rightly do the heavenly hosts worship him. Rightly should we.