Walk through Amos, verse by verse, with the great Bible Commentaries of Matthew Henry (1662 - 1714) & Adam Clarke (1760 - 1832)
8:7
The LORD hath sworn by the excellency of Jacob, Surely I will never forget any of their works. KJV
{The Lord swore against the pride of Jacob, (yea,) I shall not forget till to the end all the works of
them.} Wycliffe's Bible
God will remember their sin against them: He has sworn by the excellency of Jacob, by himself, for he can swear by no greater;