It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Fast on sighting it (the moon), and break the fast on sighting it (that is, stop fasting and celebrate Eid)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ziyad bin Sa'd except Masad bin Uqbah, and no one from Masad except Umar bin Ayyub, and Muhammad bin Ammar is alone in it."
Hadith Referenceالمعجم الأوسط / باب الهاء / 9416
Hadith Takhrij«أخرجه البيهقي فى «السنن الكبرى» برقم: 8034، وأحمد فى «مسنده» برقم: 14750، وأبو يعلى فى «مسنده» برقم: 2248، والطحاوي فى «شرح معاني الآثار» برقم: 2540، والطحاوي فى «شرح مشكل الآثار» برقم: 3775»