It is narrated from Sayyiduna Abu Juhayfah (may Allah be pleased with him): I came to the Prophet (peace and blessings be upon him) while he (peace and blessings be upon him) was in a red domed tent at al-Abtah. Sayyiduna Bilal (may Allah be pleased with him) came out to us with the leftover water from the ablution of the Prophet (peace and blessings be upon him), and we were splashing ourselves with the water when he gave the adhan; I began following his mouth this way and that.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1850