From Sahih Bukhari (Hadith 24):
Narrated 'Abdullah (bin 'Umar): Once Allah's Messenger (ﷺ) passed by an Ansari (man) who was admonishing his brother regarding Haya'. On that Allah's Messenger (ﷺ) said, "Leave him as Haya' is a part of faith." (See Hadith)
Reference: Bukhari 24