It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that he said: "The Messenger of Allah (peace and blessings be upon him) taught us the tashahhud: 'At-tahiyyatu lillahi was-salawatu wat-tayyibat, as-salamu 'alayka ayyuha an-nabiyyu wa rahmatullahi wa barakatuh, as-salamu 'alayna wa 'ala 'ibadillahis-salihin, ashhadu an la ilaha illallah, wa ashhadu anna Muhammadan 'abduhu wa rasuluh' (All verbal worship is for Allah, and all physical and financial worship is for Allah as well. 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. I bear witness that there is no deity worthy of worship except Allah, and I bear witness that Muhammad (peace and blessings be upon him) is the servant of Allah and His Messenger)."
No one narrated this hadith from Amr (may Allah have mercy on him) except Muhammad (may Allah have mercy on him).