2 Kgs 3:4

3:4 Mesha king of Moab. According to the Moabite Stone, Mesha acknowledged that, like his predecessors, he also was a vassal to Israel. He claimed to have freed his land from subjection to Israel and boasted that “Israel has perished forever.”

he had to deliver to the king. Part of Mesha’s obligations as a vassal would be to pay tribute regularly to his superior.