PRACTICE OF THE COMPANIONS H 1285 "Abu Darda's dearest friend advised him of three things which he said he would never abandon for as long as he lived. The first is to fast three days in each month, the second to offer (2-4 duha) prayer after the sun has risen and the third not to sleep until he had offered the Witr prayer." R 1285 Muslim with a chain up to Abu Darda' who related this.
1259- وعن أَبي الدرداءِ رضي الله عنه ، قَالَ : أوصاني حَبِيبـي صلى الله عليه وآله وسلم بِثَلاثٍ لَنْ أدَعَهُنَّ مَا عِشتُ : بِصِيَامِ ثَلاثَةِ أيَّامٍ مِنْ كُلِّ شَهْرٍ ، وَصَلاَةِ الضُّحَى ، وبِأنْ لاَ أنَامَ حَتَّى أُوتِرَ . رواه مسلم .