Mas’ala 5317مختصر المزنيShafi'ivol. 1, p. 406vol. 1, p. 406 وَلَوْ نَذَرَ عِتْقَ رَقَبَةٍ فَأَيُّ رَقَبَةٍ أَعْتَقَ أَجْزَأَهُ. Read the whole chapterCopy with source On the map: VowsCompare