Kitāb-ut-Tawheed : Chapter 2:
The Excellence of Tawheed and the Sins it wipes away
Narrated Ubadah bin As-Samit (radi Allaahu anhu), that Allah’s Messenger (sallAllaahu `alayhi wa sallam) said:
“Whoever testifies that there is nothing worthy of worship in truth (no God) except Allah Alone, Who is without (peer or) partner, and that Muhammad is His slave and Messenger, and that ‘Iesa (Jesus) is the slave of Allah, His Messenger, and His Word which He bestowed in Maryam (Mary) and a spirit (created) by Him, and that Paradise & Hell-fire are realities, Allah will admit him into Paradise, whatever his deeds might be.”
(Sahih Al-Bukhari, Hadith No. 3252)