Musnad Ahmad 32:1068

Bahz narrated to us, and 'Affan narrated to us, they said: Sulayman ibn al-Mughirah narrated to us, from Thabit. 'Affan said: Thabit narrated to us, he said: Anas said: We were forbidden in the Qur'an from asking the Messenger of Allah, may Allah bless him and grant him peace, about anything. He said: And it used to please us that a man from the people of the desert, who was intelligent, would come and ask the Messenger of Allah, may Allah bless him and grant him peace. He said: So a man came and said: "O Muhammad, your messenger came to us and claimed to us that you claim that Allah sent you." He said: "He spoke the truth." He said: "Then who created the heaven?" He said: "Allah." He said: "Then who created the earth?" He said: "Allah." He said: "Then who set up these mountains?" He said: "Allah." He said: "Then by the One who created the heaven, and created the earth, and set up the mountains, did Allah send you?" He said: "Yes." He said: "And your messenger claimed that upon us are five prayers in our day and our night." He said: "He spoke the truth." He said: "Then by the One who sent you, did Allah command you with this?" He said: "Yes." He said: "And your messenger claimed that upon us is Zakat on our wealth." He said: "He spoke the truth." He said: "Then by the One who sent you, did Allah command you with this?" He said: "Yes." He said: "And your messenger claimed that upon us is the fasting of the month of Ramadan in our year." 'Affan said: He said: "He spoke the truth." He said: "Then by the One who sent you, did Allah command you with this?" He said: "Yes." "And your messenger claimed that upon us is the Hajj for whoever is able to find a way to it." He said: "He spoke the truth." He said: "Then by the One who sent you, did Allah command you with this?" He said: "Yes." 'Affan said: Then he turned away, then he said: "By the One who sent you with the truth, I will not add to them nor will I decrease from them anything." The Messenger of Allah, may Allah bless him and grant him peace, said: "If he is truthful, he shall surely enter Paradise."