Nehemiah 8:6

And Ezra blessed the Lord, the great God; he opened his reading with a solemn prayer, during which the people stood, and at the conclusion of which they gave their assent with the word used for that purpose to this day. And all the people answered, Amen, Amen, with lifting up their hands, in a gesture of supplication; and they bowed their heads and worshiped the Lord with their faces to the ground, the attitude of reverent adoration.