Sunan Abi Da'ud · Hadith 3951
The Book of Manumission of Slaves - كتاب العتق
حدثنا محمد بن سليمان، حدثنا عبد الوهاب، عن سعيد، عن قتادة، عن الحسن، قال من ملك ذا رحم محرم فهو حر .
Qatadah reported 'Umar b. al-Khattab (ra) as saying: If anyone gets possession of a relative who is within the prohibited degrees, that person becomes free.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).