Commemorated May 30
Troparion of St. Isaac, Tone 3
Thou wast a model of abstinence and a foundation of the Church, O Isaac, bright light of the Fathers; for thy life was radiant with virtues and thou didst openly proclaim the Orthodox Faith. O righteous Father, pray to Christ our God to grant us His great mercy.
Kontakion of St. Isaac, Tone 8
Thou model of observance for monks and teacher of piety, thy servants praise thee, O Godbearer. As thou art the dwelling-place of divine grace, make us temples of the light of the Spirit, for we cry to thee: Rejoice, O Father Isaac.