The Book of Pilgrimage
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أَنَاخَ بِالْبَطْحَاءِ الَّتِي بِذِي الْحُلَيْفَةِ فَصَلَّى بِهَا . وَكَانَ عَبْدُ اللَّهِ بْنُ عُمَرَ يَفْعَلُ ذَلِكَ .Abdullah b. 'Umar (Allah be pleased with them) reported that Allah's Messenger (ﷺ) made (his camel) kneel down (i, e. halt at the stony ground of Dhu'l-Hulaifa) and prayed there, and so did Abdullah b. Umar (Allah be pleased with them)
From Sahih Muslim, whose reports the scholars accept as authentic.