Musnad Ahmad 651:1

'Abd al-Samad and 'Affan narrated to us, they said: Hammam narrated to us, Qatadah narrated to us, from Hanzalah al-Katib, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Whoever maintains the five prayers—their bowing, their prostration, their ablution, and their appointed times—and knows that they are the truth from Allah, will enter Paradise," or he said: "Paradise will become incumbent for him."