30 And he brought them out and said, “Sirs, what must I do to be saved?” 31 So they said, “Believe on the Lord Jesus Christ, and you will be saved, you and your household.” 32 Then they spoke the word of the Lord to him and to all who were in his house. 33 And he took them the same hour of the night and washed their stripes. And immediately he and all his family were baptized. 34 Now when he had brought them into his house, he set food before them; and he rejoiced, having believed in God with all his household (Acts 16:30–34, NKJV).
What does it mean to “believe on the Lord Jesus Christ” for salvation? Before one can do so, he or she must hear the word of the Lord since faith comes by hearing the word of God (Rom. 10:17). So, Paul and Silas “spoke the word of the Lord” to the jailer and his house (v. 32). Believing on Jesus Christ for salvation mean more than agreeing and confessing He is “the Christ, the Son of God,” since demons did as much (Luke 4:41; James 2:19). The jailer’s conversion shows us when sinners believe and are saved in Christ. This sinner was convicted of the truth when he heard God’s word. He repented of his transgressions (indicated by washing their wounds) and was immediately baptized (v. 33). Then there was great rejoicing because he (and his family) had “believed in God.” Some try using this passage to deny water baptism is essential for salvation. If that is true, why were they baptized immediately? Why was the rejoicing after baptism and not before it (v. 34)? Saving faith is not like the faith of demons. It trusts Christ and obeys from the heart His commands to repent and be baptized (Rom. 6:17-18; Mark 16:16; Acts 2:38). That kind of faith saves the soul (Matt. 7:21).