(100) باب مَتَى يُدْفَعُ مِنْ جَمْعٍ
Narrated `Amr bin Maimun:
I saw `Umar, offering the Fajr (morning) prayer at Jam'; then he got up and said, "The pagans did not use to depart (from Jam') till the sun had risen, and they used to say, 'Let the sun shine on Thabir (a mountain).' But the Prophet (ﷺ) contradicted them and departed from Jam' before sunrise."
Reference: Sahih al-Bukhari 1684
In-book reference: Book 25, Hadith 164
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 26, Hadith 744