קהלת ה:ו מדרש: Pirkei DeRabbi Eliezer

Now Jacob knew nothing of all this, and he said: Anyone who has stolen thy Teraphim shall die before his proper time; and the utterance of a righteous person is like the speech from the mouth of an angel, and (Rachel) bare and died, as it is said, "And it came to pass, as her soul was in departing, for she died" (Gen. 35:18).