Al-Kāfi #439“I once heard abu Ja‘far, Alayhi al-Salam, saying, ‘Jews and Christians cannot inherit from the Muslims but a Muslim can inherit from Jews...
Man Lā Yaḥḍuruh al-Faqīh #768"A disbeliever does not inherit from a Muslim, but a Muslim may inherit from a disbeliever - unless the Muslim has made a will (wasiyyah)...