Sunan an-Nasa'i, Volume 3, Book 24, Hadith 2935 (DarusSalam) ⓘ
It was narrated that Ibn Umar joined Hajj and Umrah (Qiran) and he performd on Tawaf and said: "This is what I saw the Messenger of Allah doing."
أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ أَيُّوبَ بْنِ مُوسَى، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَرَنَ الْحَجَّ وَالْعُمْرَةَ فَطَافَ طَوَافًا وَاحِدًا وَقَالَ هَكَذَا رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَفْعَلُهُ .
also referenced under: Hadith 2932 (Reference) & Book 24, Hadith 0 (In-Book)