Al-Awza'i said: A man narrated the hadith to me from Nafi', and al-Qasim bin Muhammad informed him that Sayyidah Aishah (may Allah be pleased with her), the wife of the Prophet (peace and blessings be upon him), narrated this hadith.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6468