Musnad Ahmad 31:48

Sufyan narrated to us, from Damrah, from Abu Sa’id—my father said: I said to Sufyan, "Did he hear it?" He said, "He claimed"—that the Messenger of Allah (peace and blessings of Allah be upon him) forbade prayer after the Asr prayer until the sun sets, and after the Subh (Fajr) prayer until it rises.