`Umar bin Al-Khattab (Radhiallahu anhu) reported:
The Messenger of Allah (SalAllahu ‘alaihi wasallam) said,
“Whoever of you performs Wudu‘ carefully and then affirms:
`Ash-hadu an la ilaha illallahu Wahdahu la sharika Lahu, wa ash-hadu anna Muhammadan `abduhu wa Rasuluhu
[I testify that there so no true god except Allah Alone, Who has no partners and that Muhammad (Sallallaahu ‘alaihi wasallam) is His slave and Messenger],’
the eight gates of Jannah are opened for him. He may enter through whichever of these gates he desires (to enter).”
In the narration in At-Tirmidhi, it is added: “Allahummaj-`alni minat-tawwabina, waj-`alni minal-mutatahhirin (O Allah make me among those who repent and purify themselves).”
Tahur means Wudu’ which is the foremost condition for Salat. One is not permitted to perform Salat without Wudu’ in the prescribed manner. Wudu’ is regarded as “half of the Salat” and this principle makes its importance clear.
Riyad-us-Saliheen – Hadith No : 1032.