Rashi on Genesis
לא יחיה LET HIM NOT LIVE — In consequence of this curse Rachel died on the journey (Genesis Rabbah 74:9).
Rashbam on Genesis
לא יחיה, meaning that Yaakov himself will avenge such a crime from its perpetrator.
Sforno on Genesis
לא יחיה. He thought that one of the servants must have stolen the teraphim in order to worship them as he had been in the habit of doing before becoming part of Yaakov’s household.