From the Shorter Catechism

Q. 88. What are the outward and ordinary means whereby Christ communi- cateth to us the benefits of redemption?

A. The outward and ordinary means whereby Christ communicateth to us the benefits of redemption are, his ordinances, especially the Word, Sacraments, and prayer; all which are made effectual to the elect for salvation. Matt. 28:19-20; Acts 2:42, 46-47.