Sayyiduna Abu Mas'ud (may Allah be pleased with him) says: The people were fasting on completion of thirty days when two men came and testified that they had seen the new crescent the previous day, so the Prophet (peace and blessings be upon him) ordered the people to celebrate Eid al-Fitr.
Al-Tabarani recorded it in al-Mu'jam al-Kabir. He said: No one stated that this hadith is narrated from Sayyiduna Abu Mas'ud (may Allah be pleased with him) except Ishaq bin Isma'il al-Taliqani. (Allamah al-Haythami says:) I say: This narrator is thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 4814
Hadith Gradingمحدثین:إسنادہ صحیح
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (238/17، 239)، ، أخرجه المستدرك على الصحيحين برقم: 1144»