The Catechism in Questions & Answers

523. From what does it follow that Holy Baptism with water should precede the receiving of the gift of the Holy Spirit?

When asked by his listeners what they were to do in response to his Pentecost sermon, Apostle Peter answered as follows: “Repent, and let every one of you be baptised in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit” (Acts 2: 38).