It is narrated from Sayyiduna Uthman (may Allah be pleased with him) that he said: "The Prophet (peace and blessings be upon him) sent a delegation to Yemen and appointed one of them as their leader, although he was the youngest of them all. The delegation stayed there for some days and did not set out. Then the Prophet (peace and blessings be upon him) met one of them and asked: 'O so-and-so! What is the matter with you? Have you not set out yet?' He said: 'O Messenger of Allah! Our leader is suffering from pain in his leg.' So the Prophet (peace and blessings be upon him) came to him and, blowing over him, recited seven times: 'Bismillahi wa billahi, a'udhu bi-'izzatillahi wa qudratihi min sharri ma fiha' (In the name of Allah and with Allah, I seek refuge in the might of Allah and His power from the evil of what is in it), and the man recovered.
Then an elderly man said to him (peace and blessings be upon him): 'O Messenger of Allah! Have you appointed him as leader over us although he is the youngest of us?' So the Prophet (peace and blessings be upon him) mentioned his reciting of the Qur'an (and his knowledge of it). The elder said: 'O Messenger of Allah! Were it not that I fear I would make it a pillow (that is, learn it and then sleep in heedlessness without fulfilling the right of its recitation), I would certainly learn it.' The Messenger of Allah (peace and blessings be upon him) said to him: 'Learn it, for the example of the Qur'an is like a bag filled with musk whose mouth you have tied. If you open it, the fragrance of musk will spread, and if you leave it (closed), it is still musk stored away (in its essence). Such is the example of the Qur'an when you recite it, or when it is preserved in your breast.'"
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated these two hadiths from Salamah bin Kuhayl except his son Yahya, and Isma'il bin Subayh is alone in narrating them (from him)."
Hadith Referenceالمعجم الأوسط / باب الميم / 7126
Hadith Gradingمحدثین:إسناده ضعيف لضعف يحيى بن سلمة بن كهيل
Hadith Takhrij«قال الهيثمي: فيه يحيى بن سلمة بن كهيل ضعفه الجمهور ووثقه ابن حبان وقال في أحاديث ابنه عنه مناكير قلت ليس هذا من رواية ابنه عنه «مجمع الزوائد ومنبع الفوائد، ج 7، ص 161»»