Sahih Bukhari Volume 7, Book 77, Hadith 5884

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا عَبْدَةُ، حَدَّثَنَا هِشَامُ بْنُ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ هَلَكَتْ قِلاَدَةٌ لأَسْمَاءَ، فَبَعَثَ النَّبِيُّ صلى الله عليه وسلم فِي طَلَبِهَا رِجَالاً، فَحَضَرَتِ الصَّلاَةُ وَلَيْسُوا عَلَى وُضُوءٍ وَلَمْ يَجِدُوا مَاءً، فَصَلَّوْا وَهُمْ عَلَى غَيْرِ وُضُوءٍ، فَذَكَرُوا ذَلِكَ لِلنَّبِيِّ صلى الله عليه وسلم فَأَنْزَلَ اللَّهُ آيَةَ التَّيَمُّمِ‏.‏ زَادَ ابْنُ نُمَيْرٍ عَنْ هِشَامٍ عَنْ أَبِيهِ عَنْ عَائِشَةَ اسْتَعَارَتْ مِنْ أَسْمَاءَ‏.‏

Narrated By 'Aisha : 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').