'Customs' in the Bible
They had lived according to the customs of the nations that the Lord had dispossessed before the Israelites and the customs the kings of Israel had introduced.
Even Judah did not keep the commands of the Lord their God but lived according to the customs Israel had introduced.
So they said to the king of Assyria, "The nations whom you deported and settled in the cities of Samaria do not know the customs of the God of the land, so he sent lions among them, and now they are killing them because they do not know the customs of the God of the land."
Then the king of Assyria commanded, saying, "Release one of the priests whom you deported from there, and let him go and settle there. Let him teach them the customs of the God of the land."
Yahweh they were fearing, but their gods they were serving, according to the customs of the nations from which they were deported.
They are still practicing the former customs to this day. None of them fear the Lord or observe their statutes and ordinances, the law and commandments the Lord commanded the descendants of Jacob. He had renamed him Israel.
And they did not hearken, but did after their former customs.