Musannaf Ibn Abi Shayba 16:141

Abu Bakr narrated to us, he said: Jarir narrated to us, from Qabus, from his father, that a woman asked Aisha and said: "We have neighbors among the Magians, and they have a festival, so they give us gifts." She said: "As for what was slaughtered for that day, do not eat it, but eat from their trees."