Saints Christina and Callista were sisters who once were Christians, but fearing torture, they renounced Christ and began to lead impious lives. The governor ordered them to persuade Saint Dorothy to offer sacrifice to the pagan gods, but just the reverse happened. Saint Dorothy convinced them that the mercy of God is granted to all who repent, so they corrected themselves and returned to Christ. The tormentors tied them back to back and burned them in a vat of tar. Saints Christina and Callista atoned for their sin of apostasy through martyrdom, receiving not only forgiveness, but crowns of victory from God.
Troparion — Tone 4
Your lamb Christina, calls out to You, O Jesus, in a loud voice: / “I love You, my Bridegroom, and in seeking You I endure suffering. / In baptism I was crucified so that I might reign in You, and I died so that I might live with You. / Accept me as a pure sacrifice, / for I have offered offered myself in love.” / Through her prayers save our souls, since You are merciful.