The Prophet ﷺ was never more regular and particular in offering any Nawafil than the two rakʿat (Sunna) of the Fajr prayer.

لَمْ يَكُنِ النَّبِيُّ ﷺ عَلَى شَىْءٍ مِنَ النَّوَافِلِ أَشَدَّ مِنْهُ تَعَاهُدًا عَلَى رَكْعَتَىِ الْفَجْرِ

'A'isha reported that the Apostle ﷺ was not so much particular about observing supererogatory rak'ahs as in case of the two rak'ahs of the dawn prayer.

أَنَّ النَّبِيَّ ﷺ لَمْ يَكُنْ عَلَى شَىْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنْهُ عَلَى رَكْعَتَيْنِ قَبْلَ الصُّبْحِ

I have never seen the Messenger of Allah ﷺ hastening as much in observing supererogatory as two rak'ahs before the (Fard) of the dawn prayer.

مَا رَأَيْتُ رَسُولَ اللَّهِ ﷺ فِي شَىْءٍ مِنَ النَّوَافِلِ أَسْرَعَ مِنْهُ إِلَى الرَّكْعَتَيْنِ قَبْلَ الْفَجْرِ

The Messenger of Allah ﷺ was more particular about observing the supererogatory rak'ahs before the dawn prayer than about observing any of the other supererogatory prayers.

إِنَّ رَسُولَ اللَّهِ ﷺ لَمْ يَكُنْ عَلَى شَىْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنْهُ عَلَى الرَّكْعَتَيْنِ قَبْلَ الصُّبْحِ

The Messenger of Allah ﷺ was more particular about observing the supererogatory rak'ahs before the dawn prayer than about observing any of the other supererogatory prayers. (Using translation from Abū Dāʾūd 1254)

لَمْ يَكُنْ رَسُولُ اللهِ ﷺ عَلَى شَيْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنَ الرَّكْعَتَيْنِ قَبْلَ الصُّبْحِ

The Messenger of Allah ﷺ was more particular about observing the supererogatory rak'ahs before the dawn prayer than about observing any of the other supererogatory prayers. (Using translation from Abū Dāʾūd 1254)

لَمْ يَكُنْ رَسُولُ اللهِ ﷺ عَلَى شَيْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنْهُ عَلَى الرَّكْعَتَيْنِ قَبْلَ الصُّبْحِ

[AI] She said, "The Prophet ﷺ was never more committed to any voluntary prayer than he was to the two units of prayer before Fajr (morning) prayer. I heard this from 'Ata' repeatedly."

أَنَّهَا قَالَتْ مَا كَانَ النَّبِيُّ ﷺ عَلَى شَيْءٍ مِنَ النَّوَافِلِ بِأَشَدَّ مُعَاهَدَةً مِنْهُ عَلَى الرَّكْعَتَيْنِ أَمَامَ الصُّبْحِ سَمِعْتُ هَذَا مِنْ عَطَاءٍ مِرَارًا

'A'isha reported that the Apostle ﷺ was not so much particular about observing supererogatory rak'ahs as in case of the two rak'ahs of the dawn prayer. (Using translation from Muslim 724f)

«أَنَّ نَبِيَّ اللَّهِ ﷺ لَمْ يَكُنْ عَلَى شَيْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنْهُ عَلَى الرَّكْعَتَيْنِ قَبْلَ الصُّبْحِ»

[AI] "I have never seen the Messenger of Allah ﷺ rush towards any voluntary act of worship faster than he did towards the two Rak'ahs before Fajr prayer, nor towards any booty that he could take advantage of."

«مَا رَأَيْتُ رَسُولَ اللَّهِ ﷺ يُسْرِعُ إِلَى شَيْءٍ مِنَ النَّوَافِلِ أَسْرَعَ مِنْهُ إِلَى الرَّكْعَتَيْنِ قَبْلَ الصُّبْحِ وَلَا إِلَى غَنِيمَةٍ يَغْتَنِمُهَا»

The Messenger of Allah ﷺ was more particular about observing the supererogatory rak'ahs before the dawn prayer than about observing any of the other supererogatory prayers. (Using translation from Abū Dāʾūd 1254)

«أَنَّ رَسُولَ اللَّهِ ﷺ لَمْ يَكُنْ عَلَى شَيْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنْهُ عَلَى الرَّكْعَتَيْنِ قَبْلَ الصُّبْحِ»

The Messenger of Allah ﷺ was more particular about observing the supererogatory rak'ahs before the dawn prayer than about observing any of the other supererogatory prayers. (Using translation from Abū Dāʾūd 1254)

«لَمْ يَكُنْ رَسُولُ اللهِ ﷺ عَلَى شَيْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنْهُ عَلَى الرَّكْعَتَيْنِ قَبْلَ الْفَجْرِ»

[AI] The Messenger of Allah ﷺ did not engage in any voluntary deeds more dedicatedly than he did with the two Rak'ahs before Fajr (dawn) prayer.

إِنَّ رَسُولَ اللهِ ﷺ لَمْ يَكُنْ عَلَى شَيْءٍ مِنَ النَّوَافِلِ أَشَدَّ مُعَاهَدَةً مِنْهُ عَلَى رَكْعَتَيْنِ قَبْلَ الصُّبْحِ