Qasim bin Mukhaymirah (may Allah have mercy on him) said: Alqamah (may Allah have mercy on him) took my hand, Abdullah bin Mas'ud (may Allah be pleased with him) took Alqamah's hand, and the Prophet (peace and blessings be upon him) took Ibn Mas'ud's (may Allah be pleased with him) hand and taught him the tashahhud in the prayer: "All verbal, physical and monetary acts of worship are for Allah alone. O Prophet, peace be upon you, and the mercy of Allah and His blessings. Peace be upon us and upon the righteous servants of Allah. I bear witness that there is no deity except Allah, and I bear witness that Muhammad is the servant of Allah and His Messenger."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9888