It is narrated from Abu Ja'far Muhammad bin Ali (Imam al-Baqir) (may Allah have mercy on him) that he said: "Only obligatory charity (zakah) has been made forbidden for us."
Imam al-Shafi'i (may Allah be pleased with him) said: "Sayyiduna Ali and Sayyidah Fatimah (may Allah be pleased with them both) gave their wealth in charity to Banu Hashim and Banu al-Muttalib, and that (was permissible) because it was voluntary charity."
The Shaykh (Imam al-Bayhaqi) (may Allah have mercy on him) said: "This (narration) has already passed."
Imam al-Shafi'i (may Allah be pleased with him) said: "The Prophet (peace and blessings be upon him) accepted a gift from the charity that had been given to Sayyidah Barirah (may Allah be pleased with her), and that is because from Barirah (may Allah be pleased with her) it was a voluntary gift, not charity."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الصدقات / Q13247
Sayyidah Aishah (may Allah be pleased with her) said: Meat was brought to the Prophet (peace and blessings be upon him) and it was said: "O Prophet of Allah, this is meat that was given in charity to Barirah." He (peace and blessings be upon him) said: "It is charity for Barirah and a gift for us."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الصدقات / 13247
It is narrated from Sayyiduna Anas (may Allah be pleased with him) that meat was brought to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) asked: "What is this?" They said: "This was given in charity to Barirah (may Allah be pleased with her)." The Messenger of Allah (peace and blessings be upon him) said: "For us it is a gift, and for her it is charity."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الصدقات / 13248
Sayyidah Umm Atiyyah al-Ansariyyah (may Allah be pleased with her) said: A sheep was sent to Nusaybah al-Ansariyyah, and she sent part of it to Sayyidah Aishah (may Allah be pleased with her). The Messenger of Allah (peace and blessings be upon him) asked: "Do you have anything (to eat)?" She said: "No, except what Nusaybah sent from that sheep." He (peace and blessings be upon him) said: "Bring it near; it has reached its proper place."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الصدقات / 13249