Thus says the LORD;
For three transgressions of Israel, and for four, I will not turn away its punishment; because they sold the righteous for silver, and the poor for a pair of shoes;
All Commentaries on Amos 2:6 Go To Amos 2
Cyril of Alexandria
AD 444
He did not allow Israel, that is, the tribes of Samaria, to go unpunished; instead, he submitted them to punishment. Now, the fact that they had also sinned heedlessly, consuming, as it were, the serenity due from God to the weak, would be demonstrated by His shunning them for the 3rd and 4th sins, to which they had to be subjected by suffering a dire fate and being in trouble of every kind.