Ibn Umar narrated that:
the Messenger of Allah used to dismount at Dhu Tuwa and stay there overnight unitl he prayed Subh when he was approaching Makkah. The place where the Messenger of Allah prayed was on top of the big hillock and not in the Masjid that was built later on, but it was lower than that, on top of the big hillock.
أَخْبَرَنَا عَبْدَةُ بْنُ عَبْدِ اللَّهِ، قَالَ أَنْبَأَنَا سُوَيْدٌ، قَالَ حَدَّثَنَا زُهَيْرٌ، قَالَ حَدَّثَنَا مُوسَى بْنُ عُقْبَةَ، قَالَ حَدَّثَنِي نَافِعٌ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، حَدَّثَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَنْزِلُ بِذِي طُوًى يَبِيتُ بِهِ حَتَّى يُصَلِّيَ صَلاَةَ الصُّبْحِ حِينَ يَقْدَمُ إِلَى مَكَّةَ وَمُصَلَّى رَسُولِ اللَّهِ صلى الله عليه وسلم ذَلِكَ عَلَى أَكَمَةٍ غَلِيظَةٍ لَيْسَ فِي الْمَسْجِدِ الَّذِي بُنِيَ ثَمَّ وَلَكِنْ أَسْفَلَ مِنْ ذَلِكَ عَلَى أَكَمَةٍ خَشِنَةٍ غَلِيظَةٍ ‏.‏
GradeSahih (Darussalam)
Reference : Sunan an-Nasa'i 2862
In-book reference : Book 24, Hadith 0
English translation : Vol. 3, Book 24, Hadith 2865