وَعَنْهُ أَيْضًا أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ: ((مَنْ صَلَّى مِنْ صَلَاةِ الصُّبْحِ رَكْعَةً قَبْلَ أَنْ تَطْلُعَ الشَّمْسُ ثُمَّ طَلَعَتْ فَلْيُصَلِّ إِلَيْهَا أُخْرَى))
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Whoever performs one rak‘ah of the Fajr prayer before sunrise, and then the sun rises, he should complete the second rak‘ah with it.