Walk through Amos, verse by verse, with the great Bible Commentaries of Matthew Henry (1662 - 1714) & Adam Clarke (1760 - 1832)
5:9
5:9
That strengtheneth the spoiled against the strong, so that the spoiled shall come against the fortress.
KJV
{Which scorneth destroying on the strong, and bringeth robbing on the mighty.} Wycliffe's Bible
That strengtheneth the spoiled - Who takes the part of the poor and oppressed against the oppressor; and, in the course of his providence, sets up the former, and depresses the latter.