صحیح ابن حبان
Ibn Hibban
كتاب الصوم
Book of Fasting
باب رؤية الهلال - ذكر خبر ثان يصرح بأن على الناس أن يتموا صوم رمضان ثلاثين يوما عند عدم رؤية هلال شوال
Chapter on Sighting the Crescent - Another report explicitly stating that people must complete thirty days of Ramadan if the crescent of Shawwal is not seen
1 hadith
Hadith 3459
Sayyiduna Abu Huraira (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) said: "Begin fasting upon sighting it (i.e., the new moon), and break your fast (celebrate Eid al-Fitr) upon sighting it. And if the sky is overcast for you, then complete the count of thirty (days), then celebrate Eid al-Fitr."