Umayr bin Sa'id said: Sayyiduna Ibn Mas'ud (may Allah be pleased with him) taught me the tashahhud; then he mentioned the words of the tashahhud, then (he also taught this supplication): "O Allah, I ask You for every good, that which I know and that which I do not know. O Allah, I ask You for the good that Your righteous servants asked You for, and I seek refuge in You from the evil from which Your righteous servants sought refuge. O Allah, our Lord, give us good in this world and good in the Hereafter, and protect us from the punishment of the Fire."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9904