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." (FR)
English reference (FR): Vol. 1, Book 6, Hadith 1579 (FR)
Arabic reference (FR): Book 6, Hadith 1646 (FR)