صحیح ابن حبان
Ibn Hibban
كتاب الصوم
Book of Fasting
فصل في صوم يوم الشك - ذكر الزجر عن صوم اليوم الذي يشك فيه أمن شعبان هو أم من رمضان
Section on Fasting the Day of Doubt - Warning against fasting the day of doubt, whether it is Sha’ban or Ramadan
1 hadith
Hadith 3596
Sila bin Zufar narrates: We were present with Sayyiduna Ammar bin Yasir (may Allah be pleased with him) on a day about which there was doubt as to whether it was Ramadan or not. A goat was brought, so a person withdrew. Sayyiduna Ammar bin Yasir (may Allah be pleased with him) said: Whoever fasts on this day has disobeyed Sayyiduna Abu al-Qasim (peace and blessings be upon him).