Musannaf Ibn Abi Shaybah

Hazrat Abu Al-Mutawakkil says that we asked Hazrat Abu Saeed Khudri about the method of Tashahhud, so he said the words of Tashahhud are as follows: All verbal worship, physical worship, and financial worship are for Allah. O Prophet, peace be upon you, and may Allah's mercy and blessings descend upon you. 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 Hazrat Muhammad (peace and blessings be upon him) is Allah's servant and His Messenger. After this, Hazrat Abu Saeed Khudri said that we used to write nothing except the Qur'an and the Tashahhud.