Giudici 18:17

E i cinque uomini che uscirono per spiare il paese salirono e vi entrarono, e presero l'immagine scolpita, l'efod, il terafim e l'immagine fusa, e il sacerdote si fermò all'ingresso della porta, con i seicento uomini armati delle armi da guerra».

The five men then went up to the house of God and entered it and stole the ephod, the teraphim, the graven image and the molten image. Meanwhile the priest stood at the gate with the six hundred. The five men had taken him and introduced him to the leaders of the six hundred and they had detained him there talking. He probably thought that the five were going up to worship or to thank God for his good oracle.

It is significant that the Danites do not appear to have had their own means of worship. This would confirm that they used the central sanctuary. But now they were going north, outside the promised land, and felt that they would need their own sanctuary. This would seem to confirm that, while non-orthodox, these religious objects of Micah's were compatible with Yahwism.