Adam Clarke on Amos 2:4

For three transgressions of Judah - We may take the three and four here to any latitude; for this people lived in continual hostility to their God, from the days of David to the time of Uzziah, under whom Amos prophesied. Their iniquities are summed up under three general heads:

1. They despised, or rejected the law of the Lord.

2. They kept not his statutes.

3. They followed lies, were idolaters, and followed false prophets rather than those sent by Jehovah.