Sunan an-Nasa'i
Sunan an-Nasa'i 992
أَخْبَرَنَا الْفَضْلُ بْنُ سَهْلٍ، قَالَ حَدَّثَنِي أَبُو الْجَوَّابِ، قَالَ حَدَّثَنَا عَمَّارُ بْنُ رُزَيْقٍ، عَنْ أَبِي إِسْحَاقَ، عَنْ إِبْرَاهِيِمَ بْنِ مُهَاجِرٍ، عَنْ مُجَاهِدٍ، عَنِ ابْنِ عُمَرَ، قَالَ رَمَقْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عِشْرِينَ مَرَّةً يَقْرَأُ فِي الرَّكْعَتَيْنِ بَعْدَ الْمَغْرِبِ وَفِي الرَّكْعَتَيْنِ قَبْلَ الْفَجْرِ { قُلْ يَا أَيُّهَا الْكَافِرُونَ } وَ { قُلْ هُوَ اللَّهُ أَحَدٌ } .
Al-Fadl ibn Sahl informed us: Abu al-Jawwab narrated to me: Ammar ibn Ruzayq narrated to us, from Abu Ishaq, from Ibrahim ibn Muhajir, from Mujahid, from Ibn Umar, who said: I watched the Messenger of Allah ﷺ twenty times recite Surat al-Kafirun and Surat al-Ikhlas in the two units after the sunset prayer and in the two units before the dawn prayer.
Translation notes
The quoted surahs begin with Say: O disbelievers and Say: He is Allah, One.