It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "There is no one on the face of the earth who dies without associating anything with Allah, bearing witness that I am the Messenger of Allah, while his heart is fully certain of it, except that Allah Almighty will surely forgive him." (The narrator Hissan bin Kahil says:) I asked: Did you hear this yourself from Mu'adh? The people present rebuked me (for this question), but he said: Leave him, he has not said anything bad. Yes, I heard it from Mu'adh bin Jabal, and Mu'adh maintained that he heard it from the Messenger of Allah (peace and blessings be upon him). This is a sahih hadith which trustworthy narrators have narrated; however, both of them did not report it with these words. In my view (and Allah knows best), they left it because of Hissan bin Kahil (or Ibn Kahin), since only Humayd bin Hilal al-Adawi is known for narrating from him; however, Ibn Abi Hatim mentioned that Qurrah bin Khalid also narrated from him. Both of them (the two Shaykhs) took narrations from a number of trustworthy narrators who had only one student, so by their own principles recording a hadith like this one becomes binding on them. And Allah knows best.

It is narrated from Sayyiduna Abu Umamah al-Bahili (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Modesty and reticence (caution in speech) are two branches of faith, and obscenity and (needless) eloquence are two branches of hypocrisy." This hadith is sahih on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it, although they used all of its narrators as evidence.

It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Simplicity and plainness of dress (out of detachment from the world) are part of faith; simplicity is part of faith." Imam Muslim used Salih bin Abi Salih al-Samman as evidence.