Sa'd bin Abu Waqqas (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) used to seek (Allah's) protection after prayers in these words: "Alla-humma inni a'udhu bika minal-jubni wal- bukhl, wa a'udhu bika min an uradda ila ardhalil-'umur, wa a'udhu bika min fitnatid-dunya, wa a'udhu bika min fitnatil-qabr (O Allah, I seek refuge with You from cowardice, miserliness and from being sent back to a feeble age; and, seek refuge with You from the trials of this life and those of the grave)."[Al- Bukhari].
App reference: Book 16, Hadith 14
Arabic/English book reference: Book 16, Hadith 1421