The Prescription of Wudoo in The Kitaab And Sunnah:

Allaah ta'ala says: O Ye who believe! When ye prepare for prayer, wash your faces, and your hands (and arms) to the elbows; rub your heads (with water); and (wash) your feet to the ankles [soorat-ul-Maa'idah, 5:7]

1. Abu Hurairah (radhiAllaahu'anhu) said: Rasoolullah (sallallaahu 'alaihi wa sallam) said: The Prayer of anyone of you breaching purification is not accepted unless he makes wudoo. [Al-Bukhaaree, (Fath ul-Baaree, 1/206), Muslim (no.225) and others].

2. Ibn 'Umar (radhiAllaahu 'anhumaa) said: Indeed I heard Rasoolullah (sallallaahu 'alaihi wa sallam) say: Allaah does not accept Prayer without purification, nor Sadaqah from illegally attained wealth. [Muslim (1/160) and others].

3. Ibn 'Abbaas (radhiAllaahu 'anhumaa) said: Rasolullah (sallallaahu 'alaihi wa sallam) said: Verily I have been ordered to make wudoo when I stand for Prayer. [Saheeh. Reported by Abu Dawood (no.3760); at-Tirmidhee (no.1848), and he declared it to be 'hasan-saheeh': an-Nasaa.ee (1/73). And Shaikh al-Albaanee declares it to be 'saheeh' ('Saheeh ul-Jaami', no.2333)].

4. Abu Sa'eed (radhiAllaahu 'anhu) said: Rasoolullah (sallallaahu 'alaihi wa sallam) said: The key to Prayer is purification, its 'tahreem'[1] is the takbeer and its 'tahleel'[2] is the giving salaam. [Reported by Abu Dawood (no.60); at-Tirmidhee (no.3); Ibn Maajah (no.275) and others. Declared as 'saheeh' by Shaikh al-Albaanee: ('Saheeh ul-Jaami', no.5761)].