Musnad Ahmad 1301:25

Aswad ibn Amir narrated to us, he said: Isra'il narrated to us, from 'Asim, from Muhammad ibn Sirin, from Abu al-Darda', he said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "O Abu al-Darda', do not single out the night of Friday for standing in prayer to the exclusion of other nights, nor [do not single out] the day of Friday for fasting to the exclusion of other days."