Hadith 6:51
’Urwah bin Mudarras (RAA) narrated that the Messenger of Allah (ﷺ) said:
“Anyone who offered this prayer -at al-Muzdalifah- along with us, and waited with us until we returned to Mina, and he stayed at 'Arafat (on the 9th ) before that by night or day, he would have completed the prescribed duties of Hajj." Related by the five Imams. At-Tirmidhi and Ibn Khuzaimah graded it as Sahih.
وَعَنْ عُرْوَةَ بْنِ مُضَرِّسٍ - رضى الله عنه - قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ مَنْ شَهِدَ صَلَاتَنَا هَذِهِ -يَعْنِي: بِالْمُزْدَلِفَةِ- فَوَقَفَ مَعَنَا حَتَّى نَدْفَعَ, وَقَدْ وَقَفَ بِعَرَفَةَ قَبْلَ ذَلِكَ لَيْلاً أَوْ نَهَارًا, فَقَدْ تَمَّ حَجُّهُ وَقَضَى تَفَثَهُ } رَوَاهُ اَلْخَمْسَةُ, وَصَحَّحَهُ اَلتِّرْمِذِيُّ, وَابْنُ خُزَيْمَةَ
Original Reference: Bulugh al-Maram 758