Muwatta Malik, Book 56, Hadith 1839 (In-Book)

Malik related to me that Amir ibn Abdullah ibn az-Zubayr would stop speaking when he heard thunder and say, "Glory be to Allah whom the thunder glorifies with His praise and the angels from the fear of Him." (Subhana-aladhee yusabihu ar-radu bi hamdihi wa mala'ikatu min khiyfatihi.) Then he would say, "This is a severe warning to the people of the earth."

حَدَّثَنِي مَالِكٌ، عَنْ عَامِرِ بْنِ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ، أَنَّهُ كَانَ إِذَا سَمِعَ الرَّعْدَ، تَرَكَ الْحَدِيثَ

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also referenced under: Book 56, Hadith 26 (USC-MSA)