My LORD’s BibleApostolic Constitutions, Book V 18
1You should therefore fast on the days of the passover, beginning from the second day of the week until the preparation, and the Sabbath, six days, making use of only bread, and salt, and herbs, and water for your drink; but do you abstain on these days from wine and flesh, for they are days of lamentation and not of feasting. You who are able should fast the day of the preparation and the Sabbath day entirely, tasting nothing till the cock-crowing of the night; but if any one is not able to join them both together, at least let him observe the Sabbath day; for the Lord says somewhere, speaking of Himself: When the bridegroom shall be taken away from them, in those days shall they fast. In these days, therefore, He was taken from us by the Jews, falsely so named, and fastened to the cross, and was numbered among the transgressors.