turing machines – Rice’s theorem extension

I’ve tried to solve this question below but I got stuck.

Let $P$ be a non-trivial property. Proof that the extension of Rice’s theorem is true:

If $L_1$ $in$ $P,$ $and $ $L_2$ $in$ $RE$ $setminus$ $P$ such that $L_1$ $subset$ $L_2,$ then $L_p$ $notin$ $RE.$