Ibn 'Umar (May Allah be pleased with them) reported:
Messenger of Allah (ﷺ) passed by a man of the Ansar who was admonishing his brother regarding shyness. Messenger of Allah (ﷺ) said, "Leave him alone, for modesty is a part of Iman."[Al-Bukhari and Muslim].
App reference: Book 2, Hadith 1
Arabic/English book reference: Book 2, Hadith 681