It was narrated that 'Umar bin Khattab said:
"I made a vow during the Ignorance period and I asked the Prophet (ﷺ) (about it) after I became Muslim. He told me to fulfill my vow." (IT)
English reference (IT): Vol. 3, Book 11, Hadith 2129 (IT)
Arabic reference (IT): Book 11, Hadith 2210 (IT)