Narrated Usama bin Zaid:

As soon as the Prophet departed from 'Arafat, he went towards the mountain pass, and there he answered the call of) the prayer is ahead of you (i.e. at asked, "O Allah's Apostle! Will you offer the prayer here?" He replied, "(The place of) the prayer is ahead of you (i.e. at Al-Muzdalifa)."

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ مُوسَى بْنِ عُقْبَةَ، عَنْ كُرَيْبٍ، مَوْلَى ابْنِ عَبَّاسٍ عَنْ أُسَامَةَ بْنِ زَيْدٍ ـ رضى الله عنهما ـ أَنَّ النَّبِيَّ ﷺ حَيْثُ أَفَاضَ مِنْ عَرَفَةَ مَالَ إِلَى الشِّعْبِ فَقَضَى حَاجَتَهُ فَتَوَضَّأَ فَقُلْتُ يَا رَسُولَ اللَّهِ أَتُصَلِّي فَقَالَ
" الصَّلاَةُ أَمَامَكَ ".