Musnad Ahmad 1153:2322

Ya'qub narrated to us, he said: My father narrated to us, from Ibn Ishaq, Yahya ibn 'Abbad ibn 'Abdullah ibn al-Zubayr narrated to me, from his father, from 'Aisha, the wife of the Prophet, may Allah bless him and grant him peace, she said: We set out with the Messenger of Allah, may Allah bless him and grant him peace, on one of his journeys until we were at Turban, a land between which and Medina is a *barid* (a distance of four leagues) and some miles, and it is a land in which there is no water. That was at the time of the *sahar* (pre-dawn). A necklace of mine slipped from my neck and fell. The Messenger of Allah, may Allah bless him and grant him peace, halted to search for it until dawn broke, and the people had no water with them. She said: I encountered from my father what only Allah knows of rebuke and expressions of annoyance. He said: "In every journey of the Muslims, there is trouble and affliction from you?" She said: Then Allah revealed the concession for *tayammum* (dry ablution). She said: So the people performed *tayammum* and prayed. She said: My father said when what came from Allah of the concession for the Muslims arrived: "By Allah, I did not know, O my daughter, that you were blessed. What blessing and ease Allah has placed for the Muslims in your detaining them!"