The Reason behind allowing Tayammum

Al-Bukhari recorded that `A'ishah said, "We set out with Allah's Messenger on one of his journeys until we reached Al-Bayda' or Dhat-ul-Jaysh, where a necklace of mine was broken (and lost). Allah's Messenger stayed there to search for it, and so did the people along with him. There was no water source or any water with them at that place, so the people went to Abu Bakr As-Siddiq and said, `Don't you see what `A'ishah has done! She has made Allah's Messenger and the people stay where there is no source of water and they have no water with them.' Abu Bakr came while Allah's Messenger was sleeping with his head on my thigh. He said to me, `You have detained Allah's Messenger and the people where there is no source of water and they have no water with them.' So he admonished me and said what Allah wished him to say and hit me on my flank with his hand. Nothing prevented me from moving (because of pain) but the position of Allah's Messenger on my thigh. Allah's Messenger got up when dawn broke and there was no water. So Allah revealed the verses of Tayammum, and they all performed Tayammum. Usayd bin Hudayr said, `O the family of Abu Bakr! This is not the first blessing of yours.' Then the camel on which I was riding was moved from its place and the necklace was found beneath it.'' Al-Bukhari and Muslim recorded this Hadith.

﴿أَلَمْ تَرَ إِلَى الَّذِينَ أُوتُواْ نَصِيباً مِّنَ الْكِتَـبِ يَشْتَرُونَ الضَّلـلَةَ وَيُرِيدُونَ أَن تَضِلُّواْ السَّبِيلَ - وَاللَّهُ أَعْلَمُ بِأَعْدَائِكُمْ وَكَفَى بِاللَّهِ وَلِيّاً وَكَفَى بِاللَّهِ نَصِيراً - مِّنَ الَّذِينَ هَادُواْ يُحَرِّفُونَ الْكَلِمَ عَن مَّوَاضِعِهِ وَيَقُولُونَ سَمِعْنَا وَعَصَيْنَا وَاسْمَعْ غَيْرَ مُسْمَعٍ وَرَعِنَا لَيّاً بِأَلْسِنَتِهِمْ وَطَعْناً فِى الدِّينِ وَلَوْ أَنَّهُمْ قَالُواْ سَمِعْنَا وَأَطَعْنَا وَاسْمَعْ وَانْظُرْنَا لَكَانَ خَيْراً لَّهُمْ وَأَقْوَمَ وَلَكِن لَّعَنَهُمُ اللَّهُ بِكُفْرِهِمْ فَلاَ يُؤْمِنُونَ إِلاَّ قَلِيلاً ﴾

(44. Have you not seen those (the Jews) who were given a portion of the Book, purchasing the wrong path, and wishing that you should go astray from the right path.) (45. Allah has full knowledge of your enemies, and Allah is sufficient as a Wali (Protector), and Allah is sufficient as a Helper.) (46. Among those who are Jews, there are some who displace words from (their) right places and say: "We hear your word and disobey,'' and "Hear and let you hear nothing.'' And Ra`ina with a twist of their tongues and as a mockery of the religion. And if only they had said: "We hear and obey'', and "Do make us understand,'' it would have been better for them, and more proper; but Allah has cursed them for their disbelief, so they believe not except a few.)