Amos 7:10-13 (ESV)
Then Amaziah the priest of Bethel sent to Jeroboam king of Israel, saying, “Amos has conspired against you in the midst of the house of Israel. The land is not able to bear all his words. For thus Amos has said,
“‘Jeroboam shall die by the sword,
and Israel must go into exile
away from his land.’”
And Amaziah said to Amos, “O seer, go, flee away to the land of Judah, and eat bread there, and prophesy there, but never again prophesy at Bethel, for it is the king’s sanctuary, and it is a temple of the kingdom.”
The title in this section in the ESV is “Amos Accused.” The priest, Amaziah, accuses Amos of king of Israel. Remember, at this time the kingdom was divided. Israel and Judah were separate. Amos is prophesying to the wicked kingdom of Israel to the north. The priest (Amaziah) was from Bethel, the capital city of Israel, in the north. The northern kings were all wicked. None of them worshipped God. So, when Amos is attacked and accused it is because he is standing up for righteousness in a wicked environment. He was not afraid to stand tall in this slouching world around him.
A key thought in this passage is that when one stands tall in a slouching world, one will be accused and attacked. And the attack might come from those who call themselves believers. The sad part of this is that Amaziah was supposed to point others to God, just as Amos was. They were supposed to have the same mission. But Amaziah slipped into the political and expedient world of the flesh and pleasing God. Don’t be surprised if those type of people will falsely accuse you if you stand up for righteousness. Even the most good intentions could camouflaged to look like it is helping leadership (in this send the king ... Jereoboam).
Wickedness might look like a priest protecting a king, but it is still wickedness.