Battle of Tabouk The Battle of Tabouk ( also called the Battle of Tabuk ) was a military expedition , which , according to Muslim biographies , was initiated by the Prophet Muhammad in October 630 . Muhammad led a force of as many as 30 , 000 north to Tabouk in present - day northwestern Saudi Arabia , with the intention of engaging the Byzantine army . Though not a battle in the typical sense , if historical the event would represent the opening conflict in the coming Byzantine - Arab wars . There is no contemporary Byzantine account of the events , and much of the details come from later Muslim sources . Noting this , as well as the fact that the armies never met , some Western scholars have questioned the authenticity of the details surrounding the event ; though in the Arab world it is widely held as historical . Reasons for war . According to " Ar - Rahīq al - Makhtum " , a modern Islamic hagiography of Muhammad written by the Indian Muslim author Safi - 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 . The non Muslim scholar William Muir claims that one of the reasons Heraclius decided to go to War was that he wanted to prevent the recurrence of the Expedition of Ukasha bin Al - Mihsan against the Banu Udrah and military campaigns similar to it . The Banu Udhrah was a Christian tribe that was aligned to the Byzantine Empire , before converting to Islam and aligning themselves to Muhammad . The tribe converted to Islam after Khalid ibn Walid carried out a military campaign in the area , however there were some who were still disaffected , so another campaign was carried out in the area . Preparations for War . The Muslim scholar Ibn Kathir mentions in his tafsir that the Quran verse 9 : 49 was revealed about the people who make excuses not to participate in the Jihad . In this case Al - Jadd bin Qays made an excuse not participate in the Battle of Tabuk , and Ibn Kathir says that 9 : 49 verse was revealed because of his excuse . Many rumors of the danger threatening the Muslims was carried to Mecca by Nabateans who traded from Syria to Medina . They carried rumors of Heraclius ' preparations and the existence of an enormous army said to number anywhere from 40 , 000 to several 100 , 000 besides the Lakhm , Judham and other Arab tribes allied to the Byzantines . Ibn Kathir stated that verse 9 : 81 was also revealed about the Battle of Tabuk , regarding those who made excuses Ibn Kathir also mentions that verse 9 : 29 which called for fighting against the people of the book until they pay Jizyah was " revealed " while Muhammad was preparing for the Battle of Tabuk , he wrote : Expedition . Muhammad marched northwards to Tabouk , though the Byzantine army did not initiate any form of aggression against the Muslims . The army of 30 , 000 was a great one , when compared with the previous armies of Islam . Muslims had never marched with such a great number before . After arriving at Tabouk and camping there , Muhammad ' s army was prepared to face the Byzantines . However the Byzantines were not at Tabouk . They stayed there for a number of days and scouted the area but they never came . Nevertheless , this expedition brought , in itself , credit to the Muslim forces that had gained military reputation in the remote lands of the Arabian Peninsula . The strategic long term consequence of the battle was that many Arab tribes now abandoned the Byzantines and joined with Muhammad , enlarging the Muslim state . Immediate Aftermath . Return to Medina . After returning from Medina , some companions of Muhammad believed that there was no need to fight any longer , after looking around and seeing that there were no enemies remaining to threaten the Muslims , and after the Romans had left the Muslims alone . Muhammad ' s followers began to sell their weapons , but Muhammad rebuked them , claiming there will always be a need to fight . Then , God revealed a new verse of the Quran . Ibn Kathir mentions this event and the verse as follows : Islamic primary sources . Quran . According to Safi - ur - Rahman Mubarakpuri , many verses of Surah Tawbah ( chapter 9 of the Quran ) are related to the Battle of Tabuk . The Muslim scholar Ibn Kathir mentions that verses 9 : 42 - 48 , 9 : 49 , 9 : 81 , and 9 : 29 are all related to the Battle of Tabuk or were revealed during the Battle of Tabuk .