Mishkat al-Masabih #2251

Bilal b. Yasar b. Zaid, the Prophet’s client,1 told on his father’s authority that his grandfather said he had heard God's messenger state that if anyone says, “I ask pardon of God than whom there is no god, the Living, the Eternal, and I turn to Him in repentance,” he will be pardoned, even if he has fled in time of battle. 1. The client was Zaid, Bilal’s grandfather. Tirmidhi and Abu Dawud transmitted it; but Abu Dawud has Hilal b. Yasar, and Tirmidhi calls this a gharib tradition.