Hadith 6

Bulugh al-Maram

Book 2: The Book of Prayer
Hadith 6
وَلِمُسْلِمٍ مِنْ حَدِيثِ أَبِي مُوسَى: { فَأَقَامَ اَلْفَجْرَ حِينَ اِنْشَقَّ اَلْفَجْرُ, وَالنَّاسُ لَا يَكَادُ يَعْرِفُ بَعْضُهُمْ بَعْضًا }
Abu Musa (RA) in another version of Muslim:

He (ﷺ) offered the Fajr prayer at daybreak when the people could hardly recognize one another.