Sunan Abi Dawud 4873
سنن أبي داود#4873Sahihحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا شَرِيكٌ، عَنِ الرُّكَيْنِ بْنِ الرَّبِيعِ، عَنْ نُعَيْمِ بْنِ حَنْظَلَةَ، عَنْ عَمَّارٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ كَانَ لَهُ وَجْهَانِ فِي الدُّنْيَا كَانَ لَهُ يَوْمَ الْقِيَامَةِ لِسَانَانِ مِنْ نَارٍ " .
Narrated Ammar: The Prophet (ﷺ) said: He who is two-faced in this world will have two tongues of fire on the Day of Resurrection
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:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 43:101