Malik (may Allah have mercy on him) narrates that it reached him that Abu Hurayrah (may Allah be pleased with him) used to say the same thing. So he mentioned it, and (said that) what he narrated first from Umar bin al-Khattab (may Allah be pleased with him) is the same.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6454