What did Allah reveal in order to help the Prophet Muhammad (saw) and his companions who were in a situation where there was no water?
 Narrated Aisha:                     The wife of the Prophet : We set out with Allah's Apostle on one of his journeys, and when we were at Baida' or at Dhat-al-Jaish, a necklace of mine was broken (and lost). Allah's Apostle stayed there to look for it, and so did the people along with him. Neither were they at a place of water, nor did they have any water with them. So the people went to Abu Bakr As-Siddiq and said, "Don't you see what `Aisha has done? She has made Allah's Apostle and the people, stay where there is no water and they have no water with them." Abu Bakr came while Allah's Apostle was sleeping with his head on my thigh. He said (to me), "You have detained Allah's Apostle and the people where there is no water, and they have no water with them." So he admonished me and said what Allah wished him to say, and he hit me on my flanks with his hand. Nothing prevented me from moving (because of pain! but the position of Allah's Apostle on my thigh. So Allah's Apostle got up when dawn broke and there was no water, so Allah revealed the Verse of Tayammum. Usaid bin Hudair said, "It is not the first blessing of yours, O the family of Abu Bakr." Then we made the camel on which I was riding, got up, and found the necklace under it.