Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "When you hear a man saying, 'People are destroyed,' then he has destroyed them."  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ إِذَا سَمِعْتَ الرَّجُلَ يَقُولُ هَلَكَ النَّاسُ فَهُوَ أَهْلَكُهُمْ