Sunan Abi Dawud 1798
سنن أبي داود#1798Sahihحَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرُ بْنُ عَبْدِ الْحَمِيدِ، عَنْ مَنْصُورٍ، عَنْ أَبِي وَائِلٍ، قَالَ قَالَ الصُّبَىُّ بْنُ مَعْبَدٍ أَهْلَلْتُ بِهِمَا مَعًا . فَقَالَ عُمَرُ هُدِيتَ لِسُنَّةِ نَبِيِّكَ صلى الله عليه وسلم .
Narrated Umar ibn al-Khattab: As-Subayy ibn Ma'bad said: I raised my voice in talbiyah for both of them (i.e. umrah and hajj). Thereupon Umar said: You were guided to the practice (sunnah) of your Prophet (ﷺ)
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
Shuaib Al ArnautSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 11:78