"There are four things which the Prophet never gave up: Fasting 'Ashura', (fasting during) the ten days, (fasting) three days of each month, and praying two Rak'ahs before Al-Ghadah (Fajr)." (Using translation from Nasāʾī 2416)
أَرْبَعٌ لَمْ يَكُنْ يَدَعُهُنَّ النَّبِيُّ ﷺ «صِيَامُ عَاشُورَاءَ وَالْعَشْرُ وَثَلَاثَةُ أَيَّامٍ مِنْ كُلِّ شَهْرٍ وَرَكْعَتَينِ قَبْلَ الْغَدَاةِ»