ADVISABLE FASTING ON 13th,14th and 15th H 1288 "If you fast for three days in a month, let them be the days of the 13th,14th and 15th nights of the moon. R 1288 Tirmidhi with a chain up to Abu Dharr who related that the Messenger of Allah, praise and peace be upon him, said this.
1262- وعن أَبي ذر رضي الله عنه ، قَالَ : قَالَ رسول الله صلى الله عليه وآله وسلم : "إِذَا صُمْتَ مِنَ الشَّهْرِ ثَلاَثاً، فَصُمْ ثَلاَثَ عَشْرَةَ، وَأرْبَعَ عَشْرَةَ ، وَخَمْسَ عَشْرَةَ" رواه الترمذي ، وقال : "حديث حسن" .