http://load-islam.com/artical_det.php?artical_id=520§ion=indepth&subsection=Glorious%20Quran Jibril is Ruh Al-Qudus
The proof that Jibril is the Ruh Al-Qudus is the statement of Ibn Mas`ud in explanation of this Ayah (fn. Ibn Abi Hatim 1:269). This is also the view of Ibn `Abbas, Muhammad bin Ka`b, Isma`il bin Khalid, As-Suddi, Ar-Rabi` bin Anas, `Atiyah Al-`Awfi and Qatadah (fn. Ibn Abi Hatim 1:270). Additionally, Allah said,
(Which the trustworthy Ruh (Jibril) has brought down. Upon your heart (O Muhammad ) that you may be (one) of the warners) (26:193-194).
Al-Bukhari recorded `A'ishah saying that the Messenger of Allah erected a Minbar in the Masjid on which Hassan bin Thabit (the renowned poet) used to defend the Messenger of Allah (with his poems). The Messenger of Allah said, "O Allah! Aid Hassan with Ruh Al-Qudus, for he defended Your Prophet."(fn. Fath Al-Bari 10:562).
Abu Dawud recorded this Hadith in his Sunan (fn. Abu Dawud 5:279) as did At-Tirmidhi who graded it Hasan Sahih (fn. Tuhfat Al-Ahwadhi 8:137). Further, Ibn Hibban recorded in his Sahih that Ibn Mas`ud said that the Prophet said, "Ruh Al-Qudus informed me that no soul shall die until it finishes its set provisions and term limit. Therefore, have Taqwa of Allah and seek your sustenance in the most suitable way."(fn. See As-Sunnah 14:304).(Tafsir Ibn Kathir, Abridged, Darussalam Publishers & Distributors, 2000, vol. 1, pp. 288-289)