The supplication most often recited by the Prophet (peace and blessings of Allah swt be upon him) was: "Allahumma atina fid-dunya hasanatan, wa fil-akhirati hasanatan, wa qina adhaab-annar (O our Lord! Give us in this world that which is good and in the Hereafter that which is good, and save us from the punishment of the Fire).

Related by Bukhari and Muslim. Hadith quoted from Riyad-us-Saliheen