It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that he said: One day the Messenger of Allah (peace and blessings be upon him) went out to seek (rain) water, and he (peace and blessings be upon him) led two rak'ahs without adhan or iqamah. Then he addressed us, supplicated to Allah Almighty, and turned his face towards the qiblah with his hands raised. Then he turned his cloak around, putting the right side onto the left and the left side onto the right.
Al-Nu'man bin Rashid alone narrated it from al-Zuhri.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6401