'Custom' in the Bible

And they speak to the king of Asshur, saying, 'The nations that thou hast removed, and dost place in the cities of Samaria, have not known the custom of the God of the land, and He sendeth among them the lions, and lo, they are destroying them, as they do not know the custom of the God of the land.'

And the king of Asshur commandeth, saying, 'Cause to go thither one of the priests whom ye removed thence, and they go and dwell there, and he doth teach them the custom of the God of the land.'

Jehovah they are fearing, and their gods they are serving, according to the custom of the nations whence they removed them.

and they have not hearkened, but according to their former custom they are doing,