It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whenever any matter distressed me, Jibril (peace be upon him) would appear before me and say: O Muhammad, say: 'Tawakkaltu 'alal-Hayyil-ladhi la yamut, wal-hamdu lillahil-ladhi lam yattakhidh waladan, wa lam yakun lahu sharikun fil-mulk, wa lam yakun lahu waliyyun minadh-dhull, wa kabbirhu takbira' (I have put my trust in the Ever-Living who will never die, and all praise is for Allah, who has not taken a son, and has no partner in dominion, and has no protector out of weakness; and magnify Him greatly)." [Surah al-Isra': 111] The chain of this hadith is sahih, but the two Shaykhs did not record it.