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
Abu Musa reported that the people of Khaibar (most of them were Jews) observed fast on the day of 'Ashura and they treated it as 'Id and gave their women ornaments and beautiful dresses to wear. The Messenger of Allah (ﷺ) said:
You (only) observe fast on this day.
Reference: Sahih Muslim 1131 b In-book : Book 13, Hadith 167 USC-MSA web (English) : Book 6, Hadith 2523 (deprecated)
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