Musnad Ahmad 30:1176

'Affan and 'Abd al-Samad narrated to us, they said: Hammam narrated to us, Qatadah narrated to us, from Abu Maymunah, from Abu Hurayrah, that he came to the Prophet, may Allah bless him and grant him peace, and said: "When I see you, my soul is gladdened and my eye is cooled. So inform me about everything." He said: "Everything was created from water." He said: "Inform me of a matter that, if I hold fast to it, I will enter Paradise." He said: "Spread peace, feed food, uphold ties of kinship, and pray while the people are asleep; then enter Paradise in peace." 'Abd al-Samad said: "And inform me about everything."