Sunan Ibn Majah Book 34, Hadith 19
when a man had come to the Messenger of Allah (saas), he heard him say: "O Messenger of Allah, what should I say when I ask of Allah?" He said: "Say: Allahumma-ghfirli warhamni wa 'afini warzuqni (O Allah, forgive me, have mercy on me, keep me safe and sound and grant me provision)," and he held up his four fingers apart from the thumb and said: "These combine your religious and worldly affairs."
Prophet saas used to seek refuge with Allah from cowardice, miserliness, old age, the torment of the grave and the tribulation of the heart. (Da'if)(One of the narrators) Waki' said: "Meaning when a man dies in a state of tribulation (Fitnah) and does not ask Allah to forgive him."
the Messenger of Allah (saas) taught her this supplication: "Allahumma inni as'aluka minal-khayri kullihi, 'ajilihi wa ajilihi, ma 'alimtu minhu wa ma la a'lam. Wa a'udhu bika minash-sharri kullihi, 'ajilihi wa ajilihi, ma 'alimtu minhu wa ma la a'lam. Allahumma inni as'aluka min khayri ma sa'alaka 'abduka wa nabiyyuka, wa a'udhu bika min sharri ma 'adha bihi 'abduka wa nabiyyuka. Allahumma inni as'alukal-jannatah wa ma qarrab ilayha min qawlin aw 'amalin, wa a'udhu bika minan-nari wa ma qarraba ilayha min qawlin aw 'amalin, wa as'aluka an taj'al kulla qada'in qadaytahuli khayran (O Allah, I ask You for all that is good, in this world and in the Hereafter, what I know and what I do not know. O Allah, I seek refuge with You from all evil, in this world and in the Hereafter, what I know and what I do not know. O Allah, I ask You for the good that Your slave and Prophet has asked You for, and I seek refuge with You from the evil from which Your slave and Prophet sought refuge. O Allah, I ask You for Paradise and for that which brings one closer to it, in word and deed, and I seek refuge in You from Hell and from that which brings one closer to it, in word and deed. And I ask You to make every decree that You decree concerning me good)."