He shall judge the poor of the people - The afflicted; the down-trodden; the needy. He would vindicate their cause against their oppressors; his reign would be one of impartial justice, under which the rights of the poor as well as of the rich would be respected. See the notes at Isaiah 11:4.
He shall save the children of the needy - Those in humble life; those most likely to be oppressed by others; those who have no natural protectors.
And shall break in pieces the oppressor - Shall subdue, or destroy, those who live to oppress others. See the notes at Psalms 12:5.