Midrash su Zaccaria 10:12

Why are they called teraphim?¹²The actual derivation of the word is unknown. It is used in the Hebrew Bible to denote the primitive Semitic house-gods. Because they were works of toref (“filth”), works of uncleanness. And how were they constructed? They would take a firstborn male child, kill him, and sprinkle him with salt and spices. Then they would write a demon’s name upon a gold tablet and place it beneath the child’s tongue while performing certain magical rites. After this, they inserted the corpse into a recess in the wall and lighted candles before it. They would then bow down before it, and it would speak to them in a whisper. This is stated in the verse For the teraphim have spoken vanity (Zech. 10:12). That is why Rachel stole them. Furthermore, she sought thereby to eradicate idolatry from her father’s home. However, Jacob was not aware that she had stolen them. Hence, it is written: And Rachel stole the teraphim.