Anas bin Malik (may Allah be pleased with him) says that Abu Talhah (may Allah be pleased with him) would come to his family in the forenoon and ask: "Do you have any morning meal?" If they said: "No," he would say: "Then I am fasting."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 7917