Clarifying the number of branches of faith, the best and the least of them, the virtue of modesty (Al-Haya') and the fact that it is part of faith

It is narrated on the authority of Qatada. We were sitting with 'Imran b. Husain in a company and Bushair ibn Ka'b was also amongst us. 'Imran narrated to us that on a certain occasion the Messenger of Allah (may peace and blessings be upon him) said: Modesty is a virtue through and through, or said: Modesty is a goodness complete. Upon this Bushair ibn Ka'b said: Verily we find in certain books or books of (wisdom) that it is God-inspired peace of mind or sobriety for the sake of Allah and there is also a weakness in it. Imran was so much enraged that his eyes became red and he said: I am narrating to you the hadith of the Messenger of Allah (ﷺ) and you are contradicting it. He (the narrator) said: Imran reported the hadith, He (the narrator) said: Bushair repeated, (the same thing). Imran was enraged. He (the narrator) said: We asserted: Verily Bushair is one amongst us. Abu Nujaid! There is nothing wrong, with him (Bushair).