صحیح ابن حبان
Ibn Hibban
كتاب الصوم
Book of Fasting
فصل في صوم يوم الشك - ذكر إباحة صوم المرء اليوم الذي يشك فيه أمن رمضان هو أم من شعبان إذا غم على الناس الرؤية
Section on Fasting the Day of Doubt - Permitting fasting the day of doubt if the crescent is obscured
1 hadith
Hadith 3597
Sayyiduna Abdullah bin Umar (may Allah be pleased with them) narrates: The Noble Prophet (peace and blessings be upon him) said: "Do not begin fasting until you see the crescent (of the new month), and do not celebrate Eid al-Fitr until you see it. However, if it is cloudy for you, then the ruling is different; if it is cloudy for you, then complete the counting (of the days)."