David stood up; partly out of reverence to God and his word, which was the matter of the following discourse; and partly out of respect to this great and honourable assembly.
My brethren; so he calls the princes and chief rulers, both because they had a share with him, though under him in the government; and in compliance with the Divine command, that the king should not be lifted up above his brethren, Deu_17:20.
An house of rest for the ark; a place where it might be fixed, and no more removed from place to place, as it had been.
And for the footstool; the word and is here put expositively for by the footstool, &c., he means the ark.