Ubaydullah reported,

With this chain of narration, he said, "If it is obscured from you, then complete thirty," similar to the hadith of Abu Usama.

Muslim 2500

Sahih

و حدثنا ابن نمير حدثنا أبي حدثنا

عبيد الله

بهذا الإسناد وقال فإن غم عليكم فاقدروا ثلاثين نحو حديث أبي أسامة

مسلم 2500صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Fasting
Chapter
Obligation of fasting Ramadan upon sighting Hilal and breaking the fast upon sighting Hilal, and that if it is obscured at its beginning or end the month is completed as thirty days
Numbering
Darussalam 2500
Muslim 2500