21. he appointed singers . . . that they should praise . . . as they went out before the army—Having arranged the line of procession, he gave the signal to move forwards. The Levites led the van with their musical instruments; and singing the 136th Psalm, the people went on, not as an army marching against an enemy, but returning in joyful triumph after a victory.

     2Ch 20:22-30. THE OVERTHROW OF HIS ENEMIES.

     4, 5. The secret of his confidence is his delight in communion with God (Ps 16:11; 23:6), beholding the harmony of His perfections, and seeking His favor in His temple or palace; a term applicable to the tabernacle (compare Ps 5:7). There he is safe (Ps 31:21; 61:5). The figure is changed in the last clause, but the sentiment is the same.

     17. let the beauty—or sum of His gracious acts, in their harmony, be illustrated in us, and favor our enterprise.