Musannaf Ibn Abi Shaybah

Hazrat Aswad narrates that he and Hazrat Alqamah found a manuscript, and they took it to Hazrat Abdullah and sat at his door. When the sun had declined or was about to decline, he got up and sent his maid to see who was at the door. She returned and informed him that Alqamah and Aswad were there. He said, "Allow them to come to me." When we presented ourselves, he said, "Perhaps you have been sitting at the door for quite some time." We replied, "Yes." He said, "Then why did you not ask for permission to enter?" We said, "We thought perhaps you might be sleeping." He said, "Do not think this about me! This is the hour in which we liken the prayer to the Tahajjud prayer."