Thou hast seen it; for thou beholdest mischief and spite, to requite it with thy hand: the poor committeth himself unto thee; thou art the helper of the fatherless.
Thou hast seen it - however much sinners flatter themselves, "He will never see it."
For thou beholdest mischief and spite. From God's general character as the all-seeing One, David, in faith, reasons that God must see this particular case.
Mischief, х `aamaal (H5999)] - literally, labour; and so the suffering of the afflicted (Hengstenberg); or else, the 'perverseness' (Numbers 23:21) of the wicked oppressors, as the English version, "mischief."
And spite, х ka`ac (H3708)] - literally, indignation; i:e., the spite of the wicked against the godly; or else, the just indignation of the godly at the oppression perpetrated; provocation (note, Psalms 10:2; 1 Samuel 1:6) (Henstenberg).
To requite is with thy hand - literally, 'to put (or give) it in thy hand;' as we say, 'to take a case in hand.' The Lord takes in hand the cause of His suffering people, and will, in His own good time, redress their wrongs with His all-powerful hand (Psalms 56:8). Maurer, less probably, takes it 'to imprint the sufferings of the godly on thy hands, so as not to forget them' (Isaiah 49:16).
The poor committeth himself unto thee - literally х `aazab (H5800)], 'leaves (himself and his cause entrusted) unto (literally, upon) thee.'