Canon 50
About the prohibition to stop Lent on Thursday of Holy Week.
About the fact that fasting should not be allowed on Lent, on Thursday of the last week, and thereby dishonor the entire Lent, but the entire Lent should be fasted with dry eating.
Greek original
Ὅτι οὐ δεῖ ἐν τῇ Τεσσαρακοστῇ τῇ ὑστέρᾳ ἑβδομάδι τὴν πέμπτην λύειν, καὶ ὅλην τὴν Τεσσαρακοστὴν ἀτιμάζειν· ἀλλὰ δεῖ πᾶσαν τὴν Τεσσαρακοστὴν νηστεύειν ξηροφαγοῦντας.
Parallel canons
Ап.6669Трул.2989Дион.1Тимоф.810