Its chain of transmission is sound. Al-Tirmidhi commented, “ḥasan ṣaḥīḥ (good and sound).” Al-Ḥākim said, “Its isnād is ṣaḥīḥ,” and al-Dhahabī concurred.

The report also appears in Ṣaḥīḥ Muslim through another route from her, but that wording does not mention setting up the pulpit in the mosque. Instead it contains the statement: “I heard the Messenger of Allah ﷺ say, ‘Hassān lampooned them and thereby brought healing and sought healing.’” Hassān then recited:

“You reviled Muhammad, and I answered back in his defence;
with Allah lies the recompense for that.”

—followed by the remaining verses in full.

It is further related that ʿUmar (may Allah be pleased with him) once passed by Hassān while he was declaiming poetry in the mosque. ʿUmar cast a glance at him and said, “Enough!” Hassān—sitting in a circle that included Abū Hurayrah—replied, “I used to recite poetry here when someone better than you was present.” He then turned to Abū Hurayrah and asked, “Did you hear the Messenger of Allah ﷺ say, ‘Answer on my behalf—O Allah, support him with the Holy Spirit’?” Abū Hurayrah said, “Yes.” ʿUmar then walked away, realizing that Hassān was referring to the Messenger of Allah ﷺ.

This ḥadith was recorded by al-Bukhārī, Muslim, Abū Dāwūd, al-Nasāʾī, and Aḥmad—the latter’s version being cited here—all of them through Sufyān ibn ʿUyaynah, from al-Zuhrī, from Saʿīd ibn al-Musayyib, who said … and so forth. The first additional detail appears only in Muslim, the second in all of them except al-Bukhārī, and the sixth in all of them except Abū Dāwūd.