According to Allamah Majlsi, Du'a Kumayl is the best du'a. This du'a, narrated from the prophet Khidr (a), has been taught by Imam 'Ali (a) to a prominent companion of his named Kumayl ibn Ziyad Al- Nakha'i. Although apparently prophet Khidr (a) is the one who initially composed this du'a, it can be claimed that because he is still alive and is with the Hujjah of every age and era, he may indeed have been inspired by Imam 'Ali (a). According to Sayyid ibn Tawus, Kumayl had attended an assembly at the Mosque in Basra which was addressed by Imam 'Ali (a) during which the night of the 15th of Sha'ban was mentioned. Imam 'Ali (a) said, "Whosoever keeps awake in devoutness on this night (15th Sha'ban) and recites the du'a of Prophet Khidr, undoubtedly that person's supplication will be responded to and granted." When the assembly at the mosque had dispersed, Kumayl called at the house where Imam 'Ali (a) was staying and requested him to inform him about Prophet Khidr's (a) du'a. Imam 'Ali (a) asked Kumayl to sit down, record and memorize the du'a which Imam 'Ali (a) dictated to Kumayl. Imam 'Ali (a) then advised Kumayl to recite this du'a on the eve of every Friday (that is the evening preceding the day of Friday) or once a month or at least once every year so that, as Imam 'Ali (a) added, "Allah (swt) may protect thee from the evils of enemies and the plots contrived by impostors. O Kumayl! In consideration of thy companionship and understanding, I grant thee this honour of entrusting this du'a to thee."1 The recitation of this du'a has been especially recommended on the night preceding Friday and in the middle of the month of Sha'ban. It is said that the recitation of this du'a, gives one protection from one's enemies, opens the gates of sustenance for one and offers a very helpful way for a servant to ask God's forgiveness for their sins. SOURCES This precious du'a has been mentioned in the following books, among others: 2 • Sheikh Tusi (A.H. 385-460) in his Misbah al-Mutihajjid, Qom: Isma'il Zanjani, c. A.H. 1401, 774-781. • Sayyid ibn Tawus (A.H. 589-664) in his 'Iqbal al-'A'mal, Tehran: Dar al-Kutub al-'Ilmiyya, A.H. 1390, 706-710. • Ibrihim ibn 'Ali al-'Amili al-Kaf'ami (A.H. 840-905) in his AlBalad al-Amin, 188-191. • Idem, Al-Misbah, Qom: Razi - Zahidi, A.H. 1405, 555-560.