Abdullah used to lead his father Ka'b bin Malik (may Allah be pleased with him) about after he had lost his sight. He said: I heard Ka'b bin Malik (may Allah be pleased with him) speaking; he mentions the long hadith about his repentance and himself narrates the account of his staying behind from the Battle of Tabuk: I prayed the Fajr prayer on the morning of the fiftieth night on the roof of one of our houses. I was sitting in the state that Allah has described in the Qur'an: "And the earth, despite its vastness, became narrow for them" [Surah al-Tawbah: 118]; the earth, despite its spaciousness, had become narrow for me. I heard the loud voice of someone who had climbed the mountain called Sal', saying: 'O Ka'b! Rejoice!' I fell down in prostration and understood that good news had come, for the Prophet (peace and blessings be upon him) had announced, after the Fajr prayer, the acceptance of our repentance. People were giving us the good news.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4411