The Messenger of Allah ﷺ passed by a man who was admonishing his brother about being too modest. He said, "Leave him, for modesty is part of faith."
أخبرنا هارون بن عبد الله قال حدثنا معن قال حدثنا مالك ح والحارث بن مسكين قراءة عليه وأنا أسمع عن ابن القاسم أخبرني مالك واللفظ له عن ابن شهاب
أن رسول الله ﷺ مر على رجل يعظ أخاه في الحياء فقال دعه فإن الحياء من الإيمان
Bukhari, in "Faith, Chapter: Modesty Is Part of Faith," Hadith 24, narrated it from Malik through this same chain, and it is also found in Muwatta (Yahya's recension), 2/905.