It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that indeed the Messenger of Allah (peace and blessings be upon him) passed by an Ansari who was advising his brother regarding modesty. So the Messenger of Allah (peace and blessings be upon him) said: "Leave him, for indeed modesty is part of faith."
Hadith Referenceمسند الشهاب / 155
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«إسناده صحيح ، وأخرجه البخاري 24، وأبو داود : 4795،»