Musnad Abu Ya'la al-Mawsili 140:40

Abu al-Rabi' al-Zahrani narrated to us, Hammad narrated to us, from Yazid al-Raqashi, from Anas bin Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "For me to sit with a people who remember Allah from the early morning until the sun rises is more beloved to me than everything upon which the sun rises."