It is also necessary to know this, what we received in Palestine, that on this day of Great Friday no Liturgy of the Presanctified Gifts is served, nor any other liturgy, nor do we set a table, nor eat on the day of the crucifixion. If someone is very weak (sick), or is very old, and cannot fast, they are given bread and water, after sunset. For thus we have received from the holy commandments of the holy apostles, not to eat on Good Friday, according to the words of the Lord, which he told the pharisees: that, when the Bridegroom is taken from them, then they will fast in those days. We have received this from the apostolic traditions. This is also proposed by the message of Saint Archbishop of Alexandria, Dionysius.

from the "Lenten Triodion"