What was narrated concerning fasting three days of each month Sunan Ibn Majah 1708

Arabic hadith text
حَدَّثَنَا سَهْلُ بْنُ أَبِي سَهْلٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنْ عَاصِمٍ الأَحْوَلِ، عَنْ أَبِي عُثْمَانَ، عَنْ أَبِي ذَرٍّ، قَالَ: قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏"‏ مَنْ صَامَ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ فَذَلِكَ صَوْمُ الدَّهْرِ ‏"‏ ‏.‏ فَأَنْزَلَ اللَّهُ عَزَّ وَجَلَّ تَصْدِيقَ ذَلِكَ فِي كِتَابِهِ ‏‏{مَنْ جَاءَ بِالْحَسَنَةِ فَلَهُ عَشْرُ أَمْثَالِهَا}‏ فَالْيَوْمُ بِعَشْرَةِ أَيَّامٍ ‏.‏
Translation
It wasnarrated from Abu Dharr that the Messenger of Allah (ﷺ)said

“Whoever fasts three days in every month, that is fasting for alifetime.” Then, in testimony of that, Allah revealed: “Whoeverbringsa good deed shall have ten time the like thereof to hiscredit.”[6:160] So one day is equivalent to ten (in reward).