Sahih Bukhari Volume 1, Book 7, Hadith Number 340
Then the Prophet proceeded on and the people complained to him of thirst. Thereupon he got down and called a person (the narrator ‘Auf added that Abu Raja’ had named him but he had forgotten) and ‘Ali, and ordered them to go and bring water. So they went in search of water and met a woman who was sitting on her camel between two bags of water. They asked, “Where can we find water?” She replied, “I was there (at the place of water) this hour yesterday and my people are behind me.” They requested her to accompany them. She asked, “Where?” They said, “To Allah’s Apostle.” She said, “Do you mean the man who is called the Sabi, (with a new religion)?” They replied, “Yes, the same person. So come along.” They brought her to the Prophet and narrated the whole story. He said, “Help her to dismount.” The Prophet asked for a pot, then he opened the mouths of the bags and poured some water into the pot. Then he closed the big openings of the bags and opened the small ones and the people were called upon to drink and water their animals. So they all watered their animals and they (too) all quenched their thirst and also gave water to others and last of all the Prophet gave a pot full of water to the person who was Junub and told him to pour it over his body. The woman was standing and watching all that which they were doing with her water. By Allah, when her water bags were returned the looked like as if they were more full (of water) than they had been before (Miracle of Allah’s Apostle) Then the Prophet ordered us to collect something for her; so dates, flour and Sawiq were collected which amounted to a good meal that was put in a piece of cloth. She was helped to ride on her camel and that cloth full of food-stuff was also placed in front of her and then the Prophet said to her, “We have not taken your water but Allah has given water to us.” She returned home late. Her relatives asked her: “O so and so what has delayed you?” She said, “A strange thing! Two men met me and took me to the man who is called the Sabi’ and he did such and such a thing. By Allah, he is either the greatest magician between this and this (gesturing with her index and middle fingers raising them towards the sky indicating the heaven and the earth) or he is Allah’s true Apostle.”
Afterwards the Muslims used to attack the pagans around her abode but never touched her village. One day she said to her people, “I think that these people leave you purposely. Have you got any inclination to Islam?” They obeyed her and all of them embraced Islam.
Abu ‘Abdultah said: The word Saba’a means “The one who has deserted his old religion and embraced a new religion.” Abul ‘Ailya said, “The Sabis are a sect of people of the Scripture who recite the Book of Psalms.”