Modesty is one of the roots of religiosity and it is a state which controls the servants of Allah Almighty before committing sins and also plays a crucial role in curbing the commitment of the wrongful acts. There is a Hadith from Imam Mujtaba (AS) that says: the one who has no religion has no modesty too. (Bihar al-Anwar, vol. 75, p. 111, H6)
source : erfan.ir