Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with him) narrates: Once we were with the Prophet (peace and blessings be upon him) in the upper part of the valley, intending to offer prayer. The Prophet (peace and blessings be upon him) stood up, and we also stood up. Just then a donkey came out towards us from the Shi'b of Abu Dubb, that is, the Shi'b of Abu Musa. So the Prophet (peace and blessings be upon him) held back and did not say the takbir, and Ya'qub bin Zam'ah ran towards it until he turned it back.
Imam Ahmad recorded it, and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2295