Narrated Usamah ibn Zayd:
Allah's Messenger (peace_be_upon_him) said: a Muslim is not entitled to inherit from a non-Muslim, and a non-Muslim is not entitled to inherit from a Muslim.
Narrated Umar ibn al-Khattab:
Umar ibn al-Khattab delivered a sermon on Friday and made a mention of Allah's Apostle (peace_be_upon_him) and he also made a mention of AbuBakr and then said: I do not leave behind me any problem more difficult than that of Kalalah.
I did not refer to Allah's Messenger (peace_be_upon_him) more repeatedly than in case of the problem of Kalalah, and he (the Prophet) never showed more annoyance to me than in regard to this problem, so much so that he struck my chest with his fingers and said: Umar, does the verse revealed in summer season, at the end of Surat an-Nisa' not suffice you? Umar (then) said: If I live I would give such verdict about (Kalalah) that everyone would be able to decide whether he reads the Qur'an or he does not.