Bismi Allahi arrahmani arraheem
In the name of Allah, the most Gracious, the most Merciful
Benafits of Dua Ganjul Arsh
One day Sayyidina Rasuli Akram Sall Allahu alaihi wa Aalihi wa Sallim was sitting in the Masjid and Hazrat Jibreel Alaihi Salaam brought this Dua' to Rasulullah Sall Allahu alaihi wa Aalihi wa Sallim. The riwaaya of this Dua' is very long. The gist of the isnaad is given.
Hazrat Jibreel Alaihi Salaam said that in addition to a lot of Fadhaail [favors] in this Dua', the reciter gets three things from Allahu ta 'ala. Firstly, Allah Subhaana Hoo gives him rizq [livelihood] from the ghayb [unknown sources], and thirdly, whoever recites this Dua' his enemies will not be able to overcome him. He will be superior to them. The person who does jihad will have the upper hand. He goes on a journey, he will come back with all his things. He will be safe from the shaat of shaytaan na'oootho Billahi min ash shaytanir rajeem. He will be safe from all the bad things and insects and other things on earth and al the bad things in the skies. If a person writes this Dua' out and drinks it using rain water, he will get help for various diseases. If a person suffers from an unknown illness for which the worldly doctors can find no cure and he writes it [with permission of a True Shaykh or his Khalifa etc.] with Zafran [saffron] and washes it and drinks it for twenty one  days he will get health from that Bi Ithnillah. If he doesn't have children, he will get children with the help of this Dua'.