Musannaf Ibn Abi Shaybah 9747 — The day of doubt: is it fasted?

Muhammad bin Sirin says: One day we began the morning in Basra not knowing what our position was regarding our fast on the day of doubt. So we came to Sayyiduna Anas bin Malik (may Allah be pleased with him), and he was taking harirah (a thin broth), which he used to take before going out in the morning; then he went out. Then I came to Abu al-Sawwar al-Adawi; he called for his meal and ate. Then I came to Muslim bin Yasar and found that he too was not fasting.