Bukhari :: Book 7 :: Volume 72 :: Hadith 770
A necklace belonging to Asma' was lost, and the Prophet sent men in its search. The time for the prayer became due and they were without ablution and they could not find water; therefore they prayed without ablution, They mentioned that to the Prophet . Then Allah revealed the Verse of Tayammum. ('Aisha added: that she had borrowed (the necklace) from Asma').
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