Salamah bin Nabit says: My father, grandfather, and uncle were with the Prophet Muhammad (peace and blessings be upon him). My father said: I saw the Prophet Muhammad (peace and blessings be upon him) delivering a sermon on the day of Arafah in the afternoon, riding a red camel. Then my father instructed me to perform the Tahajjud prayer, but I said: Father! I do not have enough strength for it. Upon hearing this, he said: Then at least be mindful of the two rak‘ahs before Fajr and never abandon them, and do not expose yourself during times of tribulation.