Sahih Muslim 1346 b
The Book of Pilgrimage
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
Salim b. Abdullah b. Umar reported on the authority of his father (Allah be pleased with them) that Allah's Messenger (ﷺ) came to Dhu'l- Hulaifa in the heart of the valley at the fag end of the night, and it was said to him: It is a blessed stony ground. Musa (one of the narrators) said: Salim made his came) halt at the mosque where 'Abdullah made his camel halt as seeking the place of stay of Allah's Messenger (ﷺ). It is, in fact, situated at a lower plain than the mosque, which stands in the heart of the valley, and it is between it (the mosque) (and Qibla) that that place (where Allah's Messenger (ﷺ) used to get down for rest and prayer) is situated.