Hadith 26-23

وَبِهذَا الإسناد قالَ: قالَ الرِّضا عَلَيْهِ السَّلامُ: الحَياءُ مِنَ الإِيمان.

According to the same documentation, on the authority of Al-Ridha’ (a.s.), “Being shy is due to faith.”