Abu Huraira said that God’s messenger used to say, “O God, I seek refuge in Thee from the four things: knowledge which does not profit, a heart which is not submissive, an appetite which is insatiable, and a supplication which is not heard.” Ahmad, Abu Dawud and Ibn Majah transmitted it. Tirmidhi transmitted it from ‘Abdallah b. 'Amr, and Nasa’i from both sources.