صحیح ابن حبان
Ibn Hibban
كتاب الصوم
Book of Fasting
باب آداب الصوم - ذكر الخبر الدال على أن قول الصائم لمن جهل عليه إني صائم إنما أمر أن يقول بقلبه دون النطق به
Chapter on Etiquette of Fasting - Indicating that saying “I am fasting” is intended in the heart, not verbally
1 hadith
Hadith 3483
Sayyiduna Abu Hurairah, may Allah be pleased with him, narrates this statement of the Prophet Muhammad, peace and blessings be upon him: "When you are fasting, do not speak ill of anyone. If someone speaks ill to you, then say, 'I am fasting,' and if you are standing, then sit down."