Ibn Umar reported that the Messenger of Allah ﷺ taught the tashahhud as follows, "All greetings are due to Allah, and prayers and good words. Peace be upon you, Prophet, and the mercy of Allah and His blessings."Ibn Umar said, "I added to it the words, 'and His blessings.' Peace be upon us and upon the righteous servants of Allah. I bear witness that there is no god but Allah."Ibn Umar said, "I added to it, 'alone, with no partner,' and I bear witness that Muhammad is His servant and messenger."
عن رسول الله ﷺ في التشهد: التحيات الله، الصلوات الطيبات، السلام عليك أيها النبي ورحمة الله وبركاته. قال ابن عمر زدت فيها: وبركاته السلام علينا وعلى عباد الله الصالحين، أشهد أن لا إله إلا الله قال ابن عمر زدت فيها: وحده لا شريك له وأشهد أن محمدا عبده ورسوله.
Reported by Abu Dawud (971) from Nasr bin Ali, my father narrated to me, Shuba narrated to us, from Abu Bishr, I heard Mujahid narrating from Ibn Umar, then he related the hadith. Its chain is sahih. Shuba criticized Abu Bishr and claimed that he had not heard anything directly from Mujahid, but the chain states, "I heard Mujahid," and this is explicit regarding direct hearing.It was also reported by Daraqutni (1/351) from Abu Bakr bin Abu Dawud, Nasr bin Ali narrated to us with the same wording, and he said, this is a sahih chain. Ibn Abu Adi also corroborated him in making it a raised hadith, narrating from Shuba, while others made it a stopped report.As for Ibn Umar's statement, "I added to it 'and His blessings' and 'alone, with no partner,'" this addition was not from himself. He had not heard these words from the Prophet ﷺ, but rather heard them from Abu Musa Ashari, as indicated by what Imam Ahmad reported (5360) from Affan, who said, Aban bin Yazid narrated to us, who said, Qatada narrated to me, Abdullah bin Babah Makki narrated to me, who said, I prayed beside Abdullah bin Umar. He said, when he finished the prayer, he struck his hand on his thigh and said, "Shall I not teach you the greeting of the prayer as the Messenger of Allah ﷺ used to teach us?" Then he recited these words to me, meaning the statement of Abu Musa Ashari in the tashahhud. Its chain is sahih.These words are indeed found in Abu Musa Ashari's version of the tashahhud. What appears to be the case is that Ibn Umar took a shortened form from the Prophet ﷺ, and the rest from Abu Musa Ashari, and all of it is raised to the Prophet.As for what was reported from him that the Prophet ﷺ used to teach us the tashahhud the way a teacher teaches children, this is daif. It was reported by Musaddad, Hushaym narrated to us, from Abdul-Rahman bin Ishaq, Muharib bin Dithar narrated to us, who said, I heard Ibn Umar, then he related it. It was also reported from Abdul-Wahid, Abdul-Rahman narrated to us with the same wording, adding "upon the pulpit," in Matalib Aliyah (534) and Ithaf Khayra (1974, 1975).Busiri said, its narrators are trustworthy, and Hushaym is Ibn Bashir. I say, it is not as he said, for Abdul-Rahman bin Ishaq, who is Abu Shayba Wasiti Ansari, is daif. He was declared daif by Ahmad, Ibn Main, Ibn Saad, Yaqub bin Sufyan, Abu Dawud, Nasai, and Ibn Hibban. Bukhari said, there is something questionable about him. Abu Hatim said, his hadith is daif, his hadith is objectionable, his hadith is written down but not relied upon. He was also declared daif by Saji, Aqeeli, and others. Perhaps Busiri confused him with another man of the same name.