Abu Huraira reported that an Arab came to the Prophet and said, "Guide me to a deed by doing which I shall enter paradise.” He said, “Worship God and associate nothing with Him, observe the prescribed prayer, pay the obligatory zakat, and fast during Ramadan.” He replied, "By Him in whose hand my soul is, I shall not add anything to this, or fall short of it.” Then when he turned away the Prophet said, "If anyone wishes to look at a man who will be among the people of paradise, let him look at this man.”
Anas reported God’s messenger as saying, "If anyone observes our form of prayer, faces our qibla, and eats what we kill, that one is a Muslim who has protection from God and His messenger; so do not betray God’s protection.”
Sufyan b. ‘Abdallah ath-Thaqafi reported that he said, "Messenger of God, say something about Islam concerning which I shall need to ask no one after you are gone.” (A version has "anyone else”.) He said, "Say, ‘I believe in God’, then keep to the straight path.”
Ibn ‘Umar reported God’s messenger as saying, "I am commanded to fight with men till they testify that there is no god but God and that Muhammad is God's messenger, observe the prayer and pay the zakat. When they do that they will keep their lives and their property safe from me, except for what is due to Islam; and their reckoning will be at God’s hands.”
(Bukhari and Muslim, but Muslim did not mention, "except for what is due to Islam”.)
