Musnad Abu Ya'la al-Mawsili 148:99

Muhammad ibn Isma'il al-Bakhtari al-Wasiti, Abu 'Abd Allah al-Makfuf, narrated to us, saying: Yazid ibn Harun narrated to us, saying: 'Abd al-Rahim ibn Zayd al-'Ammi narrated to us, from his father, from Anas ibn Malik, that the Prophet, peace and blessings of Allah be upon him, said: "Whoever marries has been given half of worship."