Sa'id bin Abd al-Aziz al-Tanukhi (may Allah have mercy on him) said: A woman named Umm Qirfah fell into apostasy. Sayyiduna Abu Bakr (may Allah be pleased with him) asked her to repent; she refused, so he (may Allah be pleased with him) had her killed.
Imam al-Layth (may Allah have mercy on him) said: That is what we have heard, and it is my view. Ibn Wahb said: Imam Malik (may Allah have mercy on him) said the same to me. Imam al-Shafi'i (may Allah have mercy on him) said: We could not use it as evidence, since it is weak according to the scholars of hadith. The Shaykh said: Its weakness lies in its being disconnected (munqati'), and we have narrated it through two mursal routes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المرتد / 16873