It is narrated from Sayyidah Umm Atiyyah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) sent Sayyiduna Ali (may Allah be pleased with him) with a military detachment. (She said:) Then I saw him (peace and blessings be upon him) raising his hands and saying: "O Allah, do not let me die until You show me Ali (safe and sound)."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21631