I was informed that he said that the people of Yemen should enter upon the state of Ihram at Yalamlam.
Sahih Muslim Book 15, Hadith 18
← Previous Hadith I heard the Messenger of Allah (ﷺ) as saying that the people of Medina should enter upon the state of Ihram at Dhu'l- Hulaifa, the people of Syria at Mahya'a and that is Juhfa, and the people of Najd at Qarn (al-Manazil). 'Abdullah b. 'Umar (Allah be pleased with them) said: (I did not hear it myself from him) but heard from them saying that the Messenger of Allah (ﷺ) had (also) said: The people of Yemen should enter upon the state of Ihram at Yalamlam.

Sahih Muslim Book 15, Hadith 17 Next Hadith → I heard (and he then carried the narration directly, I think to) the Messenger of Allah (ﷺ).

Sahih Muslim Book 15, Hadith 19