Sayyiduna Anas bin Malik (may Allah be pleased with him) says that Sayyiduna Abu Musa (may Allah be pleased with him) said to me: Have I not been informed that you go out fasting and come in fasting? He says: I said: Of course! He said: When you go out, go out not fasting (muftir), and when you come in, come in not fasting (muftir).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8179