May 9
The commemoration of Saint Isaac, a prophet, who, in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah, was sent that he might reveal the faithful and saving Lord to his unfaithful and sinful people unto the fulfillment of the promise which God swore to David. In the presence of the Jews, under King Manasseh, he was delivered up to be slain as a martyr.
In the Thebaid, Saint Pachomius, abbot, who, smitten while still a pagan by the witness of Christian charity towards soldiers occupying the same tent, was converted to Christian life, received the monastic habit from the anchorite Palemon, and, after seven years, in obedience to the command of God, built many cenobia to receive brothers and wrote an excellent rule for monks.