Chapter 28: Of Baptism and the Lord's Supper
Article 1. Baptism and the Lord's Supper are ordinances of positive and sovereign institution, appointed by the Lord Jesus, to be continued in His church to the end of the age.
Q. Do not then both the Word and sacraments tend to that end, to lead our faith to the sacrifice of Christ finished on the cross as the only ground of our salvation?
A. It is even so. The Holy Spirit teaches us by the gospel, and assures us by the sacraments that the salvation of all of us stands in the once for all sacrifice of Christ offered for us upon the cross.
Q. How many sacraments has Christ ordained in the New Testament?
A. Two. Baptism and the Lord’s Supper.
An Orthodox Catechism, Questions 66-67.