HOLY SPIRIT Arabic Ruhu ‘l-Quds روح القدص
The Holy Spirit is mentioned three times in the Qur’an. In the Suratu ‘n-Nahl (XVIth, 104), as the inspiring agent of the Qur’an : “Say, The Holy Spirit brought it down from thy Lord in truth.” And twice in the Suraty ‘l-Baqarah (IInd, 81 and 254), as the divine power which aided the Lord Jesus: “and We strengthened him by the Holy Spirit” (in both verses).
The Jalalan, al-Baizawi, and the Muslim commentators in general, say this Holy Spirit was the angel Gabriel who sanctified Jesus, and constantly aided Him, and who also brought the Qur’an down from heaven and revealed it to Muhammad.
For a further consideration of the subject, see SPIRIT.

Based on Hughes, Dictionary of Islam