Ezra blessed the Lord. Ezra began by an ascription of praise to Jehovah, as the Levites, probably under his direction, begin in Nehemiah 9:5, and as David began his last address to the congregation (1 Chronicles 29:10).
The great God. The epithet belongs to the writer rather than to Ezra himself, who in his own book never uses it. It recurs in this section (Nehemiah 9:32), and is also employed by Nehemiah (Nehemiah 1:5).
Amen, Amen. The repetition marks intensity of feeling, as does the lifting up their hands. Compare 2 Kings 11:14; Luke 23:21; and for the lifting up of the hands, so natural in prayer, see Psalms 134:2; 1 Timothy 2:8, etc.
Worshipped the Lord with their faces to the ground. Compare 2 Chronicles 7:3; Ezra 10:2.