Bayhaqi 2965 — The taslim releases one from the prayer

(a) It is narrated from al-Qasim bin Mukhaymirah that Alqamah took hold of my hand and narrated to me that Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) had taken hold of his hand, and the Messenger of Allah (peace and blessings be upon him) had taken hold of the hand of Sayyiduna Abdullah (may Allah be pleased with him), and he (peace and blessings be upon him) taught him the tashahhud (recited) in the prayer and said: "Say: 'At-tahiyyatu lillahi wa-s-salawatu wa-t-tayyibat, as-salamu 'alayka ayyuha-n-nabiyyu wa rahmatullahi wa barakatuh, as-salamu 'alayna wa 'ala 'ibadillahi-s-salihin' (All worship by words, deeds and wealth is for Allah. Peace be upon you, O Prophet, and the mercy of Allah and His blessings. Peace be upon us and upon all the righteous servants of Allah)."
(b) Abu Khaythamah narrates that some of my companions added this to this hadith, through al-Hasan: 'Ashhadu an la ilaha illallahu wa ashhadu anna Muhammadan 'abduhu wa rasuluh' (I bear witness that there is no god but Allah, and I bear witness that Muhammad (peace and blessings be upon him) is the servant of Allah and His Messenger).
(c) Abu Khaythamah says that, in my memory, this too has reached me through al-Hasan regarding the remainder of this hadith: "When you have done this, or completed this, then indeed your prayer is complete. Now if you wish to stand, then stand, and if you wish to sit, then sit."
(d) Ahmad bin Yunus narrated this hadith from Zuhayr and held that part of this hadith had been erased from his book or had worn away.
A group narrated this hadith from Abu Khaythamah Zuhayr bin Mu'awiyah and inserted the end of the hadith into its beginning (idraj); Yahya bin Yahya indicated that part of the hadith had gone from Zuhayr's memory from al-Hasan bin al-Hurr. Shababah bin Sawwar narrated it from Zuhayr and separated the end of the hadith from its beginning, making it the words of Abdullah bin Mas'ud, as though he took it from him before it went from his memory or his book.