“Whoever inaugurates a good practice in Islam …” – the ḥadith.
It was recorded by Muslim and others; see our remarks in al-Targhīb.

23 – Speaking about permissible matters from time to time, provided one does not make it a constant habit. This is inferred from the statement of Jābir ibn Samurah (may Allah be pleased with him):
“I was present with the Prophet ﷺ more than a hundred times [in the mosque] while his Companions were discussing poetry and certain topics from the pre-Islamic days; he would occasionally smile along with them.”

Al-Tirmidhī, al-Ṭayālisī, and Aḥmad related the ḥadith through the chain of Sharik, from Simāk, from Jābir. The wording that contains the additional detail is Aḥmad’s, and al-Ṭayālisī joins Qays ibn al-Rabīʿ with Sharik in the chain.

The isnād is ḥasan—indeed, ṣaḥīḥ—for al-Tirmidhī said: “This ḥadith is ḥasan ṣaḥīḥ, and it was also narrated by Zuhayr from Simāk.”

I add: Zuhayr’s version is found in Muslim and in Aḥmad with the same sense. Muslim also has corroboration from Abū Khaythamah whose wording is:
“He would not leave the spot where he had performed the dawn prayer until the sun had risen; when the sun rose he would stand up, and they would engage in conversation, speaking about matters of the pre-Islamic period, laughing, and he would smile.”