[Machine] The Prophet ﷺ used to hide what he would recite in them, and he mentioned, "Say, O disbelievers" [Surah Al-Kafirun 1] and "Say, He is Allah, [who is] One" [Surah Al-Ikhlas 1]. Sa'id said in the two units of Fajr prayer.
كَانَ رَسُولُ اللَّهِ ﷺ يُخْفِي مَا يَقْرَأُ فِيهِمَا وَذَكَرَتْ {قُلْ يَا أَيُّهَا الْكَافِرُونَ} [الكافرون 1] وَ {قُلْ هُوَ اللَّهُ أَحَدٌ} [الإخلاص 1] قَالَ سَعِيدٌ فِي رَكْعَتَيِ الْفَجْرِ
" Say: O unbelievers," (Qur'an, cix.) and" Say: Allah is one" (cxii.).
أَنَّ رَسُولَ اللَّهِ ﷺ قَرَأَ فِي رَكْعَتَىِ الْفَجْرِ { قُلْ يَا أَيُّهَا الْكَافِرُونَ} وَ { قُلْ هُوَ اللَّهُ أَحَدٌ}
The Messenger of Allah ﷺ recited: "Say: O you disbelievers" and "Say: He is Allah, (the) One" in the two rak'ahs of Fajr.
أَنَّ رَسُولَ اللَّهِ ﷺ قَرَأَ فِي رَكْعَتَىِ الْفَجْرِ { قُلْ يَا أَيُّهَا الْكَافِرُونَ } وَ { قُلْ هُوَ اللَّهُ أَحَدٌ }
The Prophet ﷺ would recite in the two (supererogatory) rak'ahs of the dawn prayer: "Say, O unbelievers" [Surat al-Kafiroon:1] and "Say: He is Allah, the one" [Surat al-Ikhlas:1]
أَنَّ النَّبِيَّ ﷺ قَرَأَ فِي رَكْعَتَىِ الْفَجْرِ { قُلْ يَا أَيُّهَا الْكَافِرُونَ } وَ { قُلْ هُوَ اللَّهُ أَحَدٌ }
During the two Rak'ah of Tawaf, the Messenger of Allah recited the two Surat of Ikhlas, "Say: O you disbelievers!" and: "Say: He is Allah, (the) One."
أَنَّ رَسُولَ اللَّهِ ﷺ قَرَأَ فِي رَكْعَتَىِ الطَّوَافِ بِسُورَتَىِ الإِخْلاَصِْ ( قُلْ يَا أَيُّهَا الْكَافِرُونَ ) وَ ( قُلْ هُوَ اللَّهُ أَحَدٌ )
[Machine] Regarding the reading in the two units before the Fajr prayer, she said, "The Messenger of Allah ﷺ used to recite them easier, and she mentioned saying 'O disbelievers' and saying 'He is Allah, the One'."
عَنِ الْقِرَاءَةِ فِي الرَّكْعَتَيْنِ قَبْلَ صَلَاةِ الْفَجْرِ؟ فَقَالَتْ كَانَ رَسُولُ اللهِ ﷺ يُسِرُّ الْقِرَاءَةَ فِيهِمَا وَذَكَرَتْ قُلْ يَا أَيُّهَا الْكَافِرُونَ وَقُلْ هُوَ اللهُ أَحَدٌ
The Prophet ﷺ would recite in the two (supererogatory) rak'ahs of the dawn prayer: "Say, O unbelievers" [Surat al-Kafiroon:1] and "Say: He is Allah, the one" [Surat al-Ikhlas:1] (Using translation from Abū Dāʾūd 1256)
أَسَرَّ تَعْنِي النَّبِيَّ ﷺ الْقِرَاءَةَ فِي رَكْعَتَيِ الْفَجْرِ وَقَرَأَ فِيهِمَا قُلْ يَا أَيُّهَا الْكَافِرُونَ وَقُلْ هُوَ اللهُ أَحَدٌ
[Machine] The Messenger of Allah ﷺ used to recite to them, she said, "So I think he used to recite something like 'Say, O disbelievers, and say, He is Allah, the One.'"
كَانَ رَسُولُ اللهِ ﷺ يُخَفِّفُهُمَا قَالَتْ فَأَظُنُّهُ كَانَ يَقْرَأُ بِنَحْوٍ مِنْ قُلْ يَا أَيُّهَاالْكَافِرُونَ وَقُلْ هُوَ اللهُ أَحَدٌ
“The Messenger of Allah ﷺ used to perform two Rak’ah before Fajr, and he used to say: ‘The best two Surah to recite in the two Rak’ah of Fajr are: “Say: Allah is One” [Al-Ikhlas (112)] and “Say: O you disbelievers.” [Al-Kafirun (109)] (Using translation from Ibn Mājah 1150)
كَانَ رَسُولُ اللَّهِ ﷺ يَقُولُ «نِعْمَ السُّورَتَانِ هُمَا تُقْرَآنِ فِي الرَّكْعَتَيْنِ قَبْلَ الْفَجْرِ قُلْ يَا أَيُّهَا الْكَافِرُونَ وَقُلْ هُوَ اللَّهُ أَحَدٌ»