Muwatta Malik #1963
Speech
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنِي مَالِكٌ، عَنْ عَامِرِ بْنِ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ، أَنَّهُ كَانَ إِذَا سَمِعَ الرَّعْدَ، تَرَكَ الْحَدِيثَ
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."
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About Muwatta Malik
This hadith is #1963 from Muwatta Malik, in the Book of Speech.