Narrated ‘Abdullah (bin ‘Umar) (raa) : Once Allah’s Apostle (saws) passed by an Ansari (man) who was admonishing to his brother regarding Haya’ (shyness). On that Allah’s Apostle (saws) said, “Leave him as Haya’ (shyness) is a part of faith.”
Belief – Sahih Bukhari: Volume 1, Book 2, Number 24
Yahya (raa) related to me from Malik (raa) from Ibn Shihab (Radiallahu Anhu – Translation: May Allah be pleased with him) from Salim ibn Abdullah (Radiallahu Anhu – Translation: May Allah be pleased with him) from ‘Abdullah ibn ‘Umar (Radiallahu Anhu – Translation: May Allah be pleased with him) that the Messenger of Allah (saws) passed by a man who was chiding his brother about modesty. The Messenger of Allah (saws) said, “Leave him. Modesty is part of iman.”
Good Character: Section: Modesty – Malik’s Muwatta: Book 47, Number 47.2.10
Salim (Radiallahu Anhu – Translation: May Allah be pleased with him) reported on the authority of his father that the Prophet (saws) heard a man instruction his brother about modesty. Upon this the Prophet (saws) remarked: “Modesty is an ingredient of Iman (faith).”
The Book of Faith (Kitab Al-Iman) – Sahih Muslim: Book 001, Number 0057
Zuhri (raa) has narrated this hadith with the addition of these words: He (the Holy Prophet) (saws) happened to pass by a mass of Ansar (Radiallahu Anhum – Translation: May Allah be pleased with them) who was instructing his brother (about modesty).
The Book of Faith (Kitab Al-Iman) – Sahih Muslim: Book 001, Number 0058
Commentary: The Book of Good Manners – Exaltation of Modesty
Riyadh as-Saaliheen (The Gardens of the Righteous), by Imam an-Nawawi
The Ansari, who was being lectured by his brother, was indeed an embodiment of modesty and unpretentiousness.
Such a man is never sharp in worldly affairs because modesty restrains him from following wrong ways. For this reason, modesty has been called a part of the faith. This is an inborn quality, that is, some people are unassertive by birth. Yet, if they are gradually guided and directed towards virtues, their unassumingness further increases. And in Islam it is counted a virtue.