Sahih Muslim
The Book of Prayers (Kitab Al-Salat)
Book Number: 004 / Hadith Number: 797
Ibn Mas'ud is reported to have said: The Messenger of Allah (may peace be upon him) taught me tashahhud taking my hand within his palms, in the same way as he taught me a Sura of the Qur'an, and he narrated it as narrated above.