In this verse, God is speaking through the prophet Amos, addressing the nation of Israel. The phrase "for three sins, even for four" is a poetic way of saying that the sins of Israel are numerous and have reached a tipping point. It's a pattern seen throughout the book of Amos, where God lists the transgressions of various nations. Here, the focus is on Israel's social injustices, particularly the exploitation of the vulnerable. Selling the innocent for silver and the needy for a pair of sandals illustrates the extent of their greed and disregard for human dignity.
This verse underscores God's intolerance of injustice and exploitation. It serves as a powerful reminder that God values justice and righteousness, and He expects His people to reflect these values in their treatment of others. The message is timeless, urging believers to examine their own actions and ensure they are living in a way that honors God's call for justice and compassion. It challenges us to consider how we might contribute to a more just and equitable society.