Sunan an-Nasa'i, Volume 3, Book 24, Hadith 3042 (DarusSalam) ⓘ
It was narrated that Urwah bin Mudarris said: "I saw the Messenger of Allah stading in Al-Muzdalifah and he said: 'Whoever offers this prayer whith us here then stands with us and stood before that in Arafat by nightor by day, his Hajj is complete.
أَخْبَرَنَا سَعِيدُ بْنُ عَبْدِ الرَّحْمَنِ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ إِسْمَاعِيلَ، وَدَاوُدَ، وَزَكَرِيَّا، عَنِ الشَّعْبِيِّ، عَنْ عُرْوَةَ بْنِ مُضَرِّسٍ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم وَاقِفًا بِالْمُزْدَلِفَةِ فَقَالَ " مَنْ صَلَّى مَعَنَا صَلاَتَنَا هَذِهِ هَا هُنَا ثُمَّ أَقَامَ مَعَنَا وَقَدْ وَقَفَ قَبْلَ ذَلِكَ بِعَرَفَةَ لَيْلاً أَوْ نَهَارًا فَقَدْ تَمَّ حَجُّهُ " .
also referenced under: Hadith 3039 (Reference) & Book 24, Hadith 0 (In-Book)