Vespers, then, was the most solemn office of the day and was composed of the psalms called "Lucernales" (Psalm 140 is called "psalmus lucernalis" by the Apostolic Constitutions). Cassian describes this Office as it was celebrated by the monks of Egypt and says they recited twelve psalms as at the vigil (matins). Then two lessons were read as at vigils, one from the Old, and the other from the New Testament. Each psalm was followed by a short prayer. Cassian says the Office was recited towards five or six o'clock and that all the lights were lit. The use of incense, candles, and other lights would seem to suggest the Jewish rites which accompanied the evening sacrifice (Exodus 29:39; Numbers 28:4; Psalm 140:2; Daniel 9:21; 1 Chronicles 23:30). It may thus be seen that the "Lucernarium" was, together with Vigil, the most important part of the Offices of the day, being composed of almost the same elements as the latter, at least in certain regions. Its existence in the fourth century is also confirmed by St. Augustine, St. Ambrose, St. Basil, St. Ephraem, and, a little later, by several councils in Gaul and Spain, and by the various monastic rules.