الكافي- ط الاسلامية, volume 3, page 495

3. It is a narration from him (narrator of previous Hadith) by ‘Amr ibn ‘Uthman from Hassan ibn Bakr from ‘Abd al-Rahman ibn Sa‘id al-Khazzaz who has said the following: “Abu ‘Abd Allah (a.s.), has said that in al-Kufah there is a Masjid called al-Sahlah Masjid. ‘Had my uncle, Zayd, visited it to perform Salah (prayer) and asked Allah to grant him refuge, He would have granted him refuge for twenty years. In it is the place where the rider disembarks for rest and the house of prophet Idris. There has never been anyone suffering hardships who visited this, performed two Rak‘at Salah (prayer) between the two Salah (prayer) after sunset and appealed to Allah for help whose wishes Allah did not make to come true and remove his hardships.’” “It is narrated that the limits of al-Sahlah Masjid extend up to al-Rawha.”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.