'A'ishah (RAA) narrated that The Messenger of Allah (ﷺ) said:
"Wala' is (legally) for the manumitter." Agreed upon. It is part of a long Hadith (refer to hadith no. 811). (AR)
English reference (AR): Book 15, Hadith 1472 (AR)
Arabic reference (AR): Book 15, Hadith 1428 (AR)