كتاب الحج
15  
The Book of Pilgrimage
(77)
Chapter: It is recommended to stop in Batha' of Dhul-Hulaifah and pray there when departing from Hajj and 'Umrah, or any time one passes through it
(77)
باب التَّعْرِيسِ بِذِي الْحُلَيْفَةِ وَالصَّلاَةِ بِهَا إِذَا صَدَرَ مِنَ الْحَجِّ أَوِ الْعُمْرَةِ ‏‏
Sahih Muslim 1346 a

Salim (b. Abdullah b. 'Umar) reported on the authority of his father (Allah be pleased with them) that Allah's Apostle (ﷺ) was visited by (someone, i. e. an angel) during the fag end of the night at Dhu'l-Hulaifa, and it was said to him:

Verily it is a blessed stony-ground.
وَحَدَّثَنَا مُحَمَّدُ بْنُ عَبَّادٍ، حَدَّثَنَا حَاتِمٌ، - وَهُوَ ابْنُ إِسْمَاعِيلَ - عَنْ مُوسَى، - وَهُوَ ابْنُ عُقْبَةَ - عَنْ سَالِمٍ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أُتِيَ فِي مُعَرَّسِهِ بِذِي الْحُلَيْفَةِ فَقِيلَ لَهُ إِنَّكَ بِبَطْحَاءَ مُبَارَكَةٍ ‏.‏
Reference : Sahih Muslim 1346a
In-book reference : Book 15, Hadith 489
USC-MSA web (English) reference : Book 7, Hadith 3123
  (deprecated numbering scheme)