"Muslims are all from one family and they should feel responsible for each other," Rouhani wrote in his Twitter account.
"The cooperation of Islamic countries is essential in resisting the pressure of the great powers," he added.
Rouhani is now in Malaysia to attend the 2019 Kuala Lumpur Summit.
Rouhani's visit to Malaysia is taking place at an official invitation of Prime Minister of Malaysia Mahathir Mohamad.
The event is slated to be held in the presence of 400 international figures, including 250 world leaders and political personalities from 52 countries, on December 18-21.
Participants are supposed to discuss the most important challenges in the Islamic countries and major subjects of the Muslim World.
President Rouhani is also to visit Tokyo to hold talks with Japanese Prime Minister Abe Shinzo.
The meeting is aimed at developing Iranian trade ties with Japan.
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