From Sahih Bukhari (Hadith 1525):
Narrated Nafi`:`Abdullah bin `Umar said, "Allah's Messenger (ﷺ) said, 'The people of Medina should assume Ihram from Dhul-Hulaifa; the people of Sham from Al-Juhfa; and the people of Najd from Qarn." And `Abdullah added, "I was informed that Allah's Messenger (ﷺ) had said, 'The people of Yemen should assume Ihram from Yalamlam
Reference: Bukhari 1525