Wudu' is a prerequisite for muslim before performing shalat. This obligation is based on the Qur'an and hadits. In the Qur'an wudhu' is stated implicitly in surah al maidah: 6. Tayammum is another form of a ritual ablution before praying. Such ritual ablution can be found out in surah al Nisa': 43. Tayammum becomes an substitute of wudhu' by certain circumstances which is allowed by the syari'a…