Bede the Venerable on the Hours

Bede the Venerable ca. 673-735

Now we read that three times a day Daniel bent his knees and prayed (Dan. 6:10), and the Church understands these to have been the third, sixth, and ninth hours. Also the Lord sent the Holy Spirit at the third hour, He Himself ascended the Cross at the sixth, and He yielded His soul at the ninth. He thus saw fit to enjoin these same hours preeminently upon the rest of us to sanctify them. (Commentary on Acts, Chap. 2)