The Messenger of Allah ﷺ said, "Every religion has a defining character, and the defining character of this religion is modesty."
قال رسول الله ﷺ: لكل دين خلق، وخلق هذا الدين الحياء.
Tabarani narrated it in Saghir (13/1), and Khatib in Tarikh Baghdad (4/8), both through the route of Muhammad bin Abdul-Rahman bin Sahm Antaki, who said, Isa bin Yunus narrated to us, from Malik, from Zuhri, from Anas, and he mentioned it. Tabarani said, No one narrated it from Malik except Isa bin Yunus, and Ibn Sahm was alone in narrating it from him.I say, their both being alone in narrating it does no harm, for they are both trustworthy. This hadith is not mentioned in Muwatta. What is found there instead is a narration from Zayd bin Talha bin Rukana, raising it up to the Prophet ﷺ, mentioning something similar. Malik narrated it in the chapter on Good Character (9), from Salama bin Safwan bin Salama Zurqi, from Zayd bin Talha bin Rukana, and he mentioned it.This chain is missing the Companion, for the correct view is that Zayd bin Talha was a Successor. This report with the missing link strengthens the connected version, especially since the connected version has also been narrated with a daif chain. This is what Ibn Majah (4181), Abu Yaala (3573), and Tabarani in Saghir (13/1) narrated, all through the route of Isa bin Yunus, from Muawiya bin Yahya Sadafi, from Zuhri, from Anas bin Malik, and he mentioned it.Muawiya bin Yahya is Sadafi, Abu Rawh Dimashqi, considered daif by the majority of scholars. Ibn Hibban said, He used to buy books and narrate from them, then his memory changed, so he began narrating mistakenly. Isa bin Yunus is the son of Abu Ishaq Sabi, trustworthy and precise, a narrator with many narrations, so there is nothing preventing him from narrating from both Malik and Muawiya bin Yahya together, just as Tabarani combined them both in Saghir.