Jamiat Tirmidhi: Hadith 3785

“Sa`d used to teach his children these words just as the Muktib teaches children, he would say: ‘Indeed, the Messenger of Allah (ﷺ) used to seek refuge by saying them at the end of (every) Salat: O Allah I seek refuge in You from cowardliness, I seek refuge in You from miserliness, I seek refuge in You from feeble old age, and I seek refuge in You from the trial of the world, and the punishment of the grave (Allāhumma innī a`ūdhu bika minal-jubn, wa a`ūdhu bika minal-bukhl, wa a`ūdhu bika min ardhalil-`umur, wa a`ūdhu bika min fitnatid-dunyā wa `adhābil qabr).’”