Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) says: The Prophet (peace and blessings be upon him) would teach us (the words of) the tashahhud just as he would teach us a surah of the Qur'an, and he would say: "Learn it, for there is no prayer without the tashahhud." (Allamah al-Haythami says:) I say: Part of it is recorded in the Sahih.
Imam al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains a narrator, Sufdi bin Sinan, whom Yahya bin Ma'in declared da'if (weak). Imam al-Bazzar recorded it with narrators who have been declared trustworthy, though there is disagreement about some of them, but that is not harmful, if Allah wills.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2849
Hadith Gradingمحدثین:إسنادہ حسن۔
Hadith Takhrij«أخرجه المعجم الكبير للطبراني برقم: 9922»