Unto none the twain taught it until they had said : We are but a temptation , so blaspheme not ; but they learned from the twain that wherewith they might separate man from his wife ; and they could harm none thereby save by Allah 's will . And they have learnt that which harmeth them , and profiteth them not ; and assuredly they know that whosoever purchaseth it , his is no portion in the Hereafter .