The Sufficient (Vol 6) · Hadith 172 (#Ḥadīth #6)
Chapter 30 | The Preferable and Non-preferable Milk
6. A number of our people have narrated from Sahl ibn Ziyad Ahmad ibn Muhammad from ibn abu Nasr from Hammad ibn ‘Uthaman from Ishaq ibn ‘Ammar who has said the following: “I once asked abu al-Hassan , about the case of a boy who impregnated my slave-girl who then gave birth and we needed her milk. If I give permission, will her milk be fine? He (the Imam) said, ‘Yes, it will be fine.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).