Expedition of Tabuk

The Expedition of Tabuk was the largest military mobilisation during the Prophet's ﷺ lifetime, involving approximately 30,000 soldiers who marched to the northern frontier to confront a reported Byzantine build-up. The march took place in extreme heat during harvest season, making it a severe test of faith and commitment. Many hypocrites and waverers stayed behind, and the Quran devotes extensive passages in Surah at-Tawbah to criticising their excuses and honouring the sincere believers who participated despite hardship. The famous 'three who were left behind' — Ka'b ibn Malik, Murarah ibn Rabi'ah, and Hilal ibn Umayyah — who stayed behind without valid excuse were boycotted until Allah revealed their repentance after fifty days. The Byzantine force did not engage; several border chieftains made treaties with the Muslims. Though no battle occurred, Tabuk demonstrated Muslim capacity to project force at long range and established the northern frontier of the nascent Islamic state.