Lady Aisha (may Allah be pleased with her) narrated that when the Prophet Muhammad (peace and blessings be upon him) intended to travel, he would draw lots among his wives. On one occasion, the lot came out in the names of Aisha and Hafsa (may Allah be pleased with them). The Prophet (peace be upon him) would, as usual, walk at night conversing with Aisha (may Allah be pleased with her) as they traveled. On one occasion, Hafsa (may Allah be pleased with her) said to Aisha (may Allah be pleased with her), "Why don't you ride my camel tonight and I will ride yours, so that you may see new sights and so may I?" She accepted this suggestion, and (each mounted the other's camel). After that, the Prophet (peace be upon him) came to the camel of Aisha (may Allah be pleased with her), but at that time Hafsa (may Allah be pleased with her) was sitting on it. The Messenger of Allah (peace be upon him) greeted her, then continued on. When they camped, the Prophet (peace be upon him) realized that Aisha (may Allah be pleased with her) was not there (and at this mistake, Aisha (may Allah be pleased with her) was so distressed that) when the people dismounted, the Mother of the Believers put her feet into the grass of idhkhir (in which poisonous insects are abundant) and began to pray, "O my Lord! Set upon me a scorpion or a snake that will bite me." Aisha (may Allah be pleased with her) says, "I could not say anything to the Prophet (peace be upon him) because this act was my own doing."