“Glory be to him whose praise the thunderclap sings and the angels glorify in awe of him”. He used to say, then, that the thunder-clap is a stern warning for the dwellers of earth.
سَمِعَ الرَّعْدَ تَرَكَ الْحَدِيثَ وَقَالَ سُبْحَانَ الَّذِي {يُسَبِّحُ الرَّعْدُ بِحَمْدِهِ وَالْمَلاَئِكَةُ مِنْ خِيفَتِهِ} ثُمَّ يَقُولُ إِنَّ هَذَا لَوَعِيدٌ شَدِيدٌ لأهْلِ الأرْضِ