What advice did the Messenger, peace and blessings be upon him, give to Abu ad-Darda'?

All prophetic hadiths are considered advice for the Ummah unless there is proof of their specificity, and there is nothing to specifically exclude Abu ad-Darda' from legislation. There are hadiths in which the Prophet, peace be upon him, gave him general commands for the Ummah, among them his advice to him concerning three matters: "Fasting three days of every month, observing the Duha prayer, and not sleeping until I pray Witr," and his saying to him, affirming Salman's advice: "Indeed, your Lord has a right over you, your soul has a right over you, and your family has a right over you; so give each one who has a right his due," and his saying to him: "It is not befitting for a prophet, when he prays, to raise his gaze to the sky until he finishes praying."