[Machine] 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
'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
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
'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»
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»