Sunan Abi Dawud 4973
سنن أبي داود#4973Sahihحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ، عَنْ أَبِي حَيَّانَ، عَنْ يَزِيدَ بْنِ حَيَّانَ، عَنْ زَيْدِ بْنِ أَرْقَمَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم خَطَبَهُمْ فَقَالَ " أَمَّا بَعْدُ " .
Zaid b. Arqam said that the Prophet (May peace be upon him) addressed them, saying :To proceed (amma ba’d)
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 ZaiSahih Muslim (2408)
In-book reference: 43:201