It wasnarrated from Abu Umamah that the Prophet (ﷺ) said:
"Whoeverspends the nights of the two 'Eid in praying voluntary prayers,seeking reward from Allah, his heart will not die on the Day whenhearts will die." (RU)
English reference (RU): Vol. 1, Book 7, Hadith 1782 (RU)
Arabic reference (RU): Book 7, Hadith 1854 (RU)