Silsilat al-Ahadith al-Sahihah

The Messenger of Allah (peace and blessings be upon him) said: "Whoever recites this supplication three times: 'I seek forgiveness from Allah, besides whom there is no deity worthy of worship, He is the Ever-Living, the Sustainer, and I turn to Him in repentance,' his sins will be forgiven, even if he has committed the major sin of fleeing from the battlefield." This hadith is narrated from Sayyiduna Abdullah bin Mas'ud, the freed slave of the Messenger Sayyiduna Zaid, Sayyiduna Abu Bakr as-Siddiq, Sayyiduna Abu Hurairah, Sayyiduna Abu Sa'id al-Khudri, Sayyiduna Anas bin Malik, and Sayyiduna Bara bin Azib (may Allah be pleased with them).