It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever repents before the sun rises from its west, Allah Almighty will accept his repentance."
No one narrated this hadith from Ash'ath (may Allah have mercy on him) except al-Hasan bin Abi Ja'far (may Allah have mercy on him), and no one from al-Hasan (may Allah have mercy on him) except Muslim bin Ibrahim (may Allah have mercy on him); Muhammad bin Abdullah bin Ubayd bin Aqil (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب الميم / 7344
Hadith Takhrij«أخرجه مسلم فى «صحيحه» برقم: 2703، وابن حبان فى «صحيحه» برقم: 629، والنسائي فى «السنن الكبرى» برقم: 11115، وأحمد فى «مسنده» برقم: 7826، 9253، 9640، 10563، 10731، والبزار فى «مسنده» برقم: 9840، 9841، 9917، 10040»