Ubayd Allah ibn Umar, from Nafiʿ, from Muhammad ibn Muslim Abu al-Zubayr, who said: I heard Abd Allah ibn al-Zubayr say … and he then related it.

I say: This is a good chain of transmission. Its narrators, from al-Razi upward, are trustworthy narrators whose reports were recorded by Muslim, apart from Junadah, who was truthful but prone to error.

As for Abd al-Rahman ibn Salm al-Razi, he was Abd al-Rahman ibn Muhammad ibn Salm al-Razi, attributed to his grandfather. He has an entry in Tabaqat al-Asbahaniyyin, Akhbar Asbahan, and Tadhkirat al-Huffaz, where it states:

“He was among the trustworthy narrators.”

Al-Tabarani narrated twenty-six hadiths through him in al-Muʿjam al-Awsat (4864–4890).

The hadith was also recorded by Muslim and Abu Awanah in their respective Sahih collections, as well as by others through various routes from Abu al-Zubayr with this wording. It is also cited in Sahih Abi Dawud (1350 and 1351), and they added:

“The Messenger of Allah ﷺ would recite these declarations of Allah’s oneness after every prayer.”

Ibn Hibban likewise recorded it in his Sahih (3/228–229/2005–2007).

Al-Shafiʿi recorded it in al-Umm (1/110), and through his route al-Baghawi recorded it in Sharh al-Sunnah (3/226/716), through the route of Musa ibn Uqbah from Abu al-Zubayr with this wording. Al-Shafiʿi added:

“He would say at the top of his voice: ‘None has the right to be worshipped but Allah …,’ and so on.”

This has the same meaning as the addition narrated by Muslim and others—“He would recite the declarations of Allah’s oneness …”—that is, he would raise his voice.