Page "Battle of Tabouk" Paragraph 2

According to Ar-Rahīq al-Makhtum, a modern Islamic hagiography of Muhammad written by the Indian Muslim author Saif ur-Rahman Mubarakpuri, the reason for war against the Byzantine Empire, was that one of Muhammad's ambassadors was killed by Sharhabeel bin ‘ Amr Al-Ghassani ( the governor of Al-Balqa ).

This immediately led to the Battle of Mutah.

But Mubarakpuri also claims that event was one of the reasons of the Battle of Tabouk also.

Mubarakpuri further mentions that the emperor of the Byzantine Empire, Heraclius was preparing a force to demolish the growing Muslim power in the region.