The Call to Testify That None is Worthy of Worship Except Allah

Narrated Ubadah bin As-Samit (May Allah be pleased with him), that Allah's Messenger (May the peace and blessing of Allah be upon him) said:
"Whoever testifies that

1. there is nothing worthy of worship in truth (no God) except Allah Alone, Who is without (peer or) partner, and that
2. Muhammad is His slave and Messenger, and that
3. 'Iesa (Jesus) is the slave of Allah, His Messenger, and His Word which He bestowed in Maryam (Mary) and a spirit (created) from Him, and that
4. Paradise & Hell-fire are realities,

Allah will admit him into Paradise, whatever his deeds might be."

(Sahih Al-Bukhari, Hadith No. 3252)