Rav Pinchas says, "David in the Psalms calls five times upon the Holy
One--blessed be He!--to arise. (1.) 'Arise, O Lord; save me, O my God!'
(Ps. iii. 7). (2.) 'Arise, O Lord, in Thine anger!' (Ps. vii. 6). (3.)
'Arise, O Lord, let not man prevail!' (Ps. ix. 19). (4.) 'Arise, O Lord;
O God, lift up Thine hand: forget not the humble!' (Ps. x. 12). (5.)
'Arise, O Lord; disappoint him!' But the Holy One--blessed be He!--said
unto David, 'My son, though thou call upon Me many a time to arise, I
will not arise. But when do I arise? When thou seest the poor oppressed
and the needy sighing, then will I arise.'" This explains what is
written (Ps. xii. 5), "For the oppression of the poor, for the sighing
of the needy, now will I arise, saith the Lord."
THE MIDRASHIM, _Bamidbar Rabbah_, chap. 75.