A common opening prayer taken from the Bible is, "Bless the LORD, O my soul: and all that is within me, bless his holy name" (Psalm 103:1). Also called an invocation or a call to worship, direct scripture quotations usually provide a starting framework for opening prayers.
The needs of the congregation, the particularities of the worship setting and the traditions of a particular denomination provide additional guidance in choosing an opening prayer. Through them, worshipers invite God to be in their midst as they worship and pray in His name.
Invocations are an ancient part of Christian worship. Justin Martyr includes them in his second-century liturgies, and the Bible supplies multiple calls to worship within its pages.