It wasnarrated from Umm Salamah from the Prophet (ﷺ) regarding:
"Andthat they will not disobey you in Ma'ruf (all that is good inIslam);" he said: "(It is about) wailing." (RU)
English reference (RU): Vol. 1, Book 6, Hadith 1579 (RU)
Arabic reference (RU): Book 6, Hadith 1646 (RU)