Jami` at-Tirmidhi 3371
جامع الترمذي#3371Da'ifحَدَّثَنَا عَلِيُّ بْنُ حُجْرٍ، أَخْبَرَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، عَنِ ابْنِ لَهِيعَةَ، عَنْ عُبَيْدِ اللَّهِ بْنِ أَبِي جَعْفَرٍ، عَنْ أَبَانَ بْنِ صَالِحٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " الدُّعَاءُ مُخُّ الْعِبَادَةِ " . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ لاَ نَعْرِفُهُ إِلاَّ مِنْ حَدِيثِ ابْنِ لَهِيعَةَ .
Anas bin Malik narrated that :the Prophet said: “The supplication is the essence of worship.”
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:
Ahmad Muhammad ShakirDaif
Al-AlbaniDaif
Zubair Ali ZaiDaif
In-book reference: 48:2