The Messenger of Allah ﷺ prayed beyond al-Arj. As you travel onward, about five miles from al-Arj, there is a mosque set on a small hill. Beside that mosque are two or three graves marked with piles of stones, on the right side of the road, near the milestones along the way. Abdullah used to set out from al-Arj after the sun had passed its zenith at midday, and he would pray Zuhr in that mosque.
وقال نافع إن
أن رسول الله ﷺ صلى من وراء العرج وأنت ذاهب على رأس خمسة أميال من العرج في مسجد إلى هضبة عند ذلك المسجد قبران أو ثلاثة على القبور رضم من حجارة على يمين الطريق عند سلامات الطريق بين أولئك السلامات كان عبد الله يروح من العرج بعد أن تميل الشمس بالهاجرة فيصلي الظهر في ذلك المسجد
Its chain of transmission is sahih, and it is a continuation of what came before it. Araj, with a fatha on the ayn and no vowel on the ra, the Hafiz said, is a populous village, thirteen or fourteen miles between it and Rawaytha. In Mujam al-Buldan it is said to be a populous village among the districts of Taif, and it marks the beginning of Tihamah, with seventy-eight miles between it and Madinah, and it lies in the territory of Huzayl.Qadbah, with no vowel on the dad, the Hafiz said, is higher than a sand dune but lower than a mountain. It has also been said to mean a mountain that spreads flat over the ground, and also that it means a smooth hillock.Radm means large stones, the plural of radmah, and both words have a fatha on the ra and no vowel on the dad.Salamat of the road, salamah, with either fatha or kasra on the sin, is a type of tree, its plural being salam with fatha or kasra on the sin as well, which is a broken plural, while what appears here is a sound feminine plural, which follows regular grammatical patterns and needs no explicit textual justification for its validity. It is confirmed here, as you see, in all three original manuscripts, though it is not mentioned in the lexicons.All the versions in Bukhari have it as "salat" without an alif. The Hafiz said it has a fatha on the sin and a kasra on the lam according to the version of Abu Dharr and Asili (that is, among the transmitters of Sahih Bukhari), while in the version of the rest it has a fatha on the lam. It has been said that with a kasra it means rocks, and with a fatha it means small trees. However, the version in the Musnad here has "salamat" with an alif, which confirms that what is meant is trees.