Ibn Shihab narrates: It reached me that Sayyidah Aishah and Hafsah (may Allah be pleased with them both) began the day observing a voluntary fast, and food was given to them as a gift, so they broke their fast with it. Then the Prophet (peace and blessings be upon him) came in to them. Aishah (may Allah be pleased with her) said: Hafsah (may Allah be pleased with her) got ahead of me in speaking, and she was her father's daughter. She said: "O Messenger of Allah, Aishah (may Allah be pleased with her) and I began the day observing voluntary fasts; then we were given food as a gift and we broke our fast." The Messenger of Allah (peace and blessings be upon him) said: "Make it up on another day in its place."
This hadith was narrated from al-Zuhri munqati' (with a broken chain) by the trustworthy huffaz among his companions: Malik bin Anas, Yunus bin Yazid, Ma'mar bin Rashid, Ibn Jurayj, Yahya bin Sa'id, Ubaydullah bin Umar, Sufyan bin Uyaynah, Muhammad bin al-Walid al-Zubaydi, Bakr bin Wa'il and others.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8363