The Failure to Join Tabuk
The expedition to Tabuk (modern Saudi Arabia-Jordan border) was one of the most difficult of the Prophet’s campaigns — in summer heat, against a Byzantine-allied force. The Prophet’s call was urgent. Ka’b, though healthy and financially capable (unlike the genuinely poor who had genuine excuses), kept delaying. He kept saying “tomorrow” — and the army left without him.
He narrated: “I never had more resources, more ability, and more physical capacity than I had during that expedition. And yet I stayed behind.”
The Fifty Days (9:118)
The Prophet instructed all Muslims not to speak to Ka’b or the other two — Mararah ibn al-Rabi’ and Hilal ibn Umayya. Fifty days of social death in a community that was his entire world. Ka’b’s account: “The earth seemed to close in on me despite its vastness — I could not find a place to go.”
Even his own wife was sent back to her family by command. Ka’b said: “I used to pray in the mosque, stand near the Prophet, give him salaam, and ask myself whether he had moved his lips in response or not.”
On the fiftieth day, the revelation came: “Allah has turned in forgiveness to the Prophet and the Muhajirin and the Ansar who followed him in the hour of difficulty — after the hearts of some of them almost deviated. Then He turned to them in forgiveness. Indeed, He was to them Kind and Merciful. And [He also forgave] the three who were left behind…” (9:117-118)
The Lesson: Truthfulness Under Pressure
Ka’b noted that the other defaulters had lied to the Prophet with excuses — they received temporary acceptance but no divine pardon. Ka’b told the truth: “I had no excuse.” His truthfulness, not his action, is what the Quran praises: “…so that they should not despair of Allah’s mercy. Indeed, Allah is Forgiving and Merciful.” (9:118)
See also: Sahaba, Tawbat Nasuha, Tawba, Khilafa Rashida, Quran Sciences, Tafsir Overview