Muwatta Malik 1812
موطأ مالك#1812Sahihوَحَدَّثَنِي مَالِكٌ، عَنْ سُهَيْلِ بْنِ أَبِي صَالِحٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا سَمِعْتَ الرَّجُلَ يَقُولُ هَلَكَ النَّاسُ . فَهُوَ أَهْلَكُهُمْ " .
Malik related to me from Suhayl ibn Abu Salih from his father from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "When you hear a man say, 'The people are ruined,' he himself is the most ruined of them all
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:
Salim al-HilaliSahih
In-book reference: 56:2