Muwatta Malik 1836
موطأ مالك#1836SahihThese are the words of a Companion, not of the Prophet ﷺ. The chain is graded on its own terms.
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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 56:26