First of all, let us look at this hadith in which the dua of Jibreel is mentioned and its virtues are pointed out.
The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Jibreel came down to me when I was praying behind the Maqaam and when I had finished praying I called upon my Lord, and said: ‘My Beloved, teach me something for my ummah so that when I depart this world and leave them, they may call upon Allaah and He will forgive them.” Jibreel said: “Whoever among your ummah bears witness that there is no god but Allaah and that you are Muhammad the Messenger of Allaah, and fasts the three days of al-beed, the thirteenth, fourteenth and fifteenth of each month, then calls upon Allaah with this du’aa’, which is written around the Throne. By the power of this du’aa’, O Muhammad, I descend and ascend. By this du’aa’ the Angel of Death takes the souls of the believers. This du’aa’ is written on the covers and pillars of the Ka’bah. Whoever among your ummah recites this du’aa’ will be safe from the torment of the grave and he will be one of those who are safe on the day of the great terror and from the death of the evildoers and Allaah will grant him independence of means, and he will granted provision from a source he never could imagine, and you will be his intercessor on the Day of Resurrection, O Muhammad…: ‘In the name of Allaah, the Most Gracious the Most Merciful. May Allaah send blessings upon Muhammad and his pure family. Glory be to You, You are Allaah, there is no god but You, You are the Guardian, the Protector; Glory be to You, You are Allaah, there is no god but You, You are the Fashioner, the Most Merciful; Glory be to You, You are Allaah, there is no god but You, You are All-Hearing, All-Knowing; Glory be to You, You are Allaah, there is no god but You, You are the Ever-Living, Sustainer; Glory be to You, You are Allaah, there is no god but You, You are All-Seeing, the Truthful; Glory be to You, You are Allaah, there is no god but You, You are the Expander, the Subtle; Glory be to You, You are Allaah, there is no god but You, You are the Most High, the Most Great; Glory be to You…” etc. In the authentic sources of islamic knowledge, there is no basis for this hadith and so of this so-called dua of Jibreel. It is not even found in the daeef reports. This hadith is falsely attributed to the prophet Muhammad (peace be upon him). Whoever is familiar with the wording of ahaadeeth and du’aa’s will have no doubt that it is a fabrication of the heretics. Describing the virtues of this du’aa’ it was said: “Whoever writes it on his shroud with the dust of al-Husayn (peace be upon him) will be protected from the torment of the grave”!
Some of the phrases used are indicative of the folly of the author, as he thinks that this du’aa’ can trick the guardians of the faith. Listen to what he says: “The Messenger of Allaah (peace and blessings of Allaah be upon him) said, and I memorized it and taught it to the believers of our party and our supporters”!
As for the exaggerations about the rewards to be earned, and the mistakes in grammar and spelling, there are many such. At the beginning it says: “O Allaah, send blessings upon Muhammad and the family of Muhammad, there is no god but Allaah, the number of those who proclaim His Oneness, Allaah is Most great, the number of those who proclaim His greatness, praise be to Allaah, the number of those who praise Him, glory be to Allaah the number of those who glorify Him, I ask Allaah for forgiveness, I ask Allaah for forgiveness, the number of those who ask for
forgiveness.” Whatever the case, in the saheeh Sunnah there is enough to suffice and we have no need of these misguided myths. Our advice to our brother is to read Husn al-Muslim (available in English under the title “The Fortress of the Muslim”) or Saheeh al-Kalim al-Tayyib, and the du’aa’s narrated by the trustworthy imams such as al-Bukhaari and Muslim in the chapters on du’aa’ in their books.
And Allaah knows best.