(Imam Bukhari narrates that) Abu Al-Yaman narrated to us, he said: Shu'aib informed us, he said: Abu Az-Zinad narrated to us, from Al-A'raj, from Hazrat Abu Hurairah (may Allāh be pleased with him), that the Messenger of Allāh ﷺ said:

Whoever stood (in prayer) on Lailat-ul-Qadr with faith and seeking reward, his previous sins are forgiven.