It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said: Whatever trial befell Sayyiduna Dawud (peace be upon him) after the decree was only because of something about himself that pleased him. That was that he said: O my Lord, there is no hour of the night or day in which someone of the family of Dawud is not worshipping You, praying to You, or glorifying You or proclaiming Your greatness; and he mentioned several other things. Allah Almighty disliked this and said: O Dawud, all of this is only by My enabling; had it not been for My help, you would not have had the strength for it. By My might and majesty, I shall surely leave you to yourself for one day. He said: O Lord, then tell me about that day. And on that very day he fell into the trial. This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.