20 Then David said to all the assembly, "Now bless the Lord your God." So all the assembly blessed the Lord God of their fathers, and bowed their heads and prostrated themselves before the Lord and the king.
This great assembly joined with David in adoring God. Whoever is the mouth of the congregation, those only have the benefit who join him, not by bowing down the head, so much as by lifting up the soul. Solomon sat on the throne of the Lord. Solomon's kingdom typified the kingdom of the Messiah, whose throne is the throne of the Lord.
Matthew Henry's Commentary on 1 Chronicles 29:20
Commentary on 1 Chronicles 29:20-25
(Read 1 Chronicles 29:20-25)
This great assembly joined with David in adoring God. Whoever is the mouth of the congregation, those only have the benefit who join him, not by bowing down the head, so much as by lifting up the soul. Solomon sat on the throne of the Lord. Solomon's kingdom typified the kingdom of the Messiah, whose throne is the throne of the Lord.