That she borrowed a necklace from Asma' and it was lost. Messenger of Allah ﷺ sent some of his companions to look for it. During their journey the time of prayer was due and they prayed without ablution. When they returned to the Prophet ﷺ they complained about it. So the Divine Verse of Tayammum was revealed. Usaid bin Hudair said (to ʿAisha), "May Allah reward you handsomely. By Allah, whenever you have a difficulty, Allah took you out of it and brought with it, a Blessing for the Muslims."
أَنَّهَا اسْتَعَارَتْ مِنْ أَسْمَاءَ قِلاَدَةً فَهَلَكَتْ فَأَرْسَلَ رَسُولُ اللَّهِ ﷺ نَاسًا مِنْ أَصْحَابِهِ فِي طَلَبِهَا فَأَدْرَكَتْهُمُ الصَّلاَةُ فَصَلَّوْا بِغَيْرِ وُضُوءٍ فَلَمَّا أَتَوُا النَّبِيَّ ﷺ شَكَوْا ذَلِكَ إِلَيْهِ فَنَزَلَتْ آيَةُ التَّيَمُّمِ فَقَالَ أُسَيْدُ بْنُ حُضَيْرٍ جَزَاكِ اللَّهُ خَيْرًا فَوَاللَّهِ مَا نَزَلَ بِكِ أَمْرٌ قَطُّ إِلاَّ جَعَلَ اللَّهُ لَكِ مِنْهُ مَخْرَجًا وَجَعَلَ لِلْمُسْلِمِينَ فِيهِ بَرَكَةً