The Prophet ﷺ would pray two rak'ahs before the dawn prayer lightly so much so that I would say: Did he recite Surah al-Fatihah in them.
كَانَ النَّبِيُّ ﷺ يُخَفِّفُ الرَّكْعَتَيْنِ قَبْلَ صَلاَةِ الْفَجْرِ حَتَّى إِنِّي لأَقُولُ هَلْ قَرَأَ فِيهِمَا بِأُمِّ الْقُرْآنِ
أَنَّهَا كَانَتْ تَقُولُ كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي رَكْعَتَىِ الْفَجْرِ فَيُخَفِّفُ حَتَّى إِنِّي أَقُولُ هَلْ قَرَأَ فِيهِمَا بِأُمِّ الْقُرْآنِ
"I would see the Messenger of Allah ﷺ praying two rak'ahs of Fajr and making them so brief that I said: 'Did he recite the Umm Al-Kitab in them?'"
إِنْ كُنْتُ لأَرَى رَسُولَ اللَّهِ ﷺ يُصَلِّي رَكْعَتَىِ الْفَجْرِ فَيُخَفِّفُهُمَا حَتَّى أَقُولَ أَقَرَأَ فِيهِمَا بِأُمِّ الْكِتَابِ
Malik related to me from Yahya ibn Said that A'isha, the wife of the Prophet ﷺ said, "The Messenger of Allah ﷺ used to pray the two rakas of the dawn (fajr) so quickly that I would say to myself 'Has he recited the umm al-Qur'an or not?' "
أَنَّ عَائِشَةَ زَوْجَ النَّبِيِّ ﷺ قَالَتْ إِنْ كَانَ رَسُولُ اللَّهِ ﷺ لَيُخَفِّفُ رَكْعَتَىِ الْفَجْرِ حَتَّى إِنِّي لأَقُولُ أَقَرَأَ بِأُمِّ الْقُرْآنِ أَمْ لاَ
[Machine] She heard Aisha say, "If the Messenger of Allah ﷺ used to perform the two Rak'ahs before dawn, he would shorten them. I would even ask, 'Did he recite in them the Mother of the Quran?'"
أَنَّهَا سَمِعَتْ عَائِشَةَ تَقُولُ إِنْ كَانَ رَسُولُ اللهِ ﷺ لَيُصَلِّي الرَّكْعَتَيْنِ اللَّتَيْنِ قَبْلَ الْفَجْرِ فَيُخَفِّفُهُمَا حَتَّى إِنْ كُنْتُ لَأَقُولُ هَلْ قَرَأَ فِيهِمَا بِأُمِّ الْقُرْآنِ
[Machine] The Messenger of Allah ﷺ used to pray two rak'ahs before dawn prayer and he would shorten them to the point that I would doubt whether he recited Al-Fatiha in them or not.
كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي الرَّكْعَتَيْنِ قَبْلَ الْغَدَاةِ فَيُخَفِّفُهُمَا حَتَّى إِنِّي لَأَشُكُّ أَقَرَأَ فِيهِمَا بِفَاتِحَةِ الْكِتَابِ أَمْ لَا؟
[Machine] The Messenger of Allah ﷺ used to pray the two units of prayer before the dawn (Fajr) prayer, and he would shorten them until I would wonder if he had recited the Umm Al-Quran.
كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي الرَّكْعَتَيْنِ اللَّتَيْنِ قَبْلَ الْفَجْرِ فَيُخَفِّفُهُمَا حَتَّى أَقُولَ هَلْ قَرَأَ بِأُمِّ الْقُرْآنِ
The Prophet ﷺ would pray two rak'ahs before the dawn prayer lightly so much so that I would say: Did he recite Surah al-Fatihah in them. (Using translation from Abū Dāʾūd 1255)
«كَانَ النَّبِيُّ ﷺ لَيُصَلِّي رَكْعَتَيِ الْفَجْرِ فَيُخَفِّفُهُمَا حَتَّى إِنِّي لَأَقُولُ هَلْ قَرَأَ فِيهِمَا بِأُمِّ الْقُرْآنِ؟ »
"I would see the Messenger of Allah ﷺ praying two rak'ahs of Fajr and making them so brief that I said: 'Did he recite the Umm Al-Kitab in them?'" (Using translation from Nasāʾī 946)
إِنْ كُنْتُ لَأَرَى رَسُولَ اللهِ ﷺ يُصَلِّي رَكْعَتَيِ الْفَجْرِ فَيُخَفِّفُهُمَا حَتَّى أَقُولَ مَا قَرَأَ فِيهِمَا بِأُمِّ الْكِتَابِ