Chapter 16: The Book of Pilgrimage
Salim b. Abdullah b. Umar reported on the authority of his father (Allah be pleased with them) that Allah' s Apostle (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 Apostle used to get down for rest and prayer) is situated.
Sahih Muslim 1346b