Encouragement to honor one's neighbor and guest, and the obligation to remain silent unless one has something good to say, and the fact that all of that is part of faith
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَمُحَمَّدُ بْنُ رُمْحٍ، جَمِيعًا عَنِ اللَّيْثِ بْنِ سَعْدٍ، - قَالَ ابْنُ رُمْحٍ أَخْبَرَنَا اللَّيْثُ، - عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ، أَنَّ عِرَاكًا، أَخْبَرَهُ أَنَّ عُرْوَةَ أَخْبَرَهُ أَنَّ عَائِشَةَ أَخْبَرَتْهُ أَنَّ قُرَيْشًا كَانَتْ تَصُومُ عَاشُورَاءَ فِي الْجَاهِلِيَّةِ ثُمَّ أَمَرَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِصِيَامِهِ حَتَّى فُرِضَ رَمَضَانُ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم مَنْ شَاءَ فَلْيَصُمْهُ وَمَنْ شَاءَ فَلْيُفْطِرْهُ "
A'isha (Allah be pleased with her) reported that the Quraish used to fast on the day of Ashura during the pre-Islamic days. The Messenger of Allah (ﷺ) then commanded to fast on that day till (fasting) in Ramadan became obligatory. Then the Messenger of Allah (ﷺ) said:
He who wishes to fast should do so, and he who wishes to break it may do so.
Reference: Sahih Muslim 1125 e In-book : Book 13, Hadith 147 USC-MSA web (English) : Book 6, Hadith 2503 (deprecated)
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