Mas’ala 8890المبسوطHanafivol. 4, p. 201vol. 4, p. 201 وَإِنْ سَفُلَ؛ لِأَنَّ اسْمَ الِابْنِ يَتَنَاوَلُهُ مَجَازًا، Read the whole chapterCopy with source On the map: MarriageCompare