ʿUmar ؓ prayed Fajr when he was in Jamʿ. Abu Dawood said: We were with ʿUmar in Jamo, and he said: The mustrikoort used not to move on until the sun rose, and they would say: Shine, (Mount) Thabeer. The Prophet ﷺ of Allah differed from them and moved on before the sun rose.
أَبُو دَاوُدَ كُنَّا مَعَ عُمَرَ بِجَمْعٍ فَقَالَ إِنَّ الْمُشْرِكِينَ كَانُوا لَا يُفِيضُونَ حَتَّى تَطْلُعَ الشَّمْسُ وَيَقُولُونَ أَشْرِقْ ثَبِيرُ وَإِنَّ نَبِيَّ اللهِ ﷺ خَالَفَهُمْ فَأَفَاضَ قَبْلَ طُلُوعِ الشَّمْسِ