Jami` at-Tirmidhi 3247
جامع الترمذي#3247Sahihحَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، وَالأَعْمَشِ، عَنْ ذَرٍّ، عَنْ يُسَيْعٍ الْحَضْرَمِيِّ، عَنِ النُّعْمَانِ بْنِ بَشِيرٍ، قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ " الدُّعَاءُ هُوَ الْعِبَادَةُ " . ثُمَّ قَرَأَ : ( وقَالَ رَبُّكُمُ ادْعُونِي أَسْتَجِبْ لَكُمْ إِنَّ الَّذِينَ يَسْتَكْبِرُونَ عَنْ عِبَادَتِي سَيَدْخُلُونَ جَهَنَّمَ دَاخِرِينَ ) قَالَ أَبُو عِيسَى . هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
Narrated An-Nu'man bin Bashir:that the Prophet (ﷺ) said: "Supplication is the worship." Then he recited: 'And your Lord said: 'Call upon Me, I will answer you. Verily, those who scorn my My worship, they will surely enter Hell in humiliation (40:)
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:
In-book reference: 47:299