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." (DE)
English reference (DE): Vol. 1, Book 7, Hadith 1782 (DE)
Arabic reference (DE): Book 7, Hadith 1854 (DE)