In Acts 16, the Philippian jailer asked Paul and Silas the question, “What must I do to be saved?”

What is the most succinct answer, you can come up with, to that question?

Sample answer:
Believe that Jesus rose from the dead after dying on the cross to pay the penalty for our sins.

Paul addresses salvation in 1 Corinthians 15:1-11 (NLT)

The Resurrection of Christ

 

1 Corinthians 15:1-11 (NLT)
¹ Let me now remind you, dear brothers and sisters, of the Good News I preached to you before. You welcomed it then, and you still stand firm in it. ² It is this Good News that saves you if you continue to believe the message I told you—unless, of course, you believed something that was never true in the first place.
³ I passed on to you what was most important and what had also been passed on to me. Christ died for our sins, just as the Scriptures said. ⁴ He was buried, and he was raised from the dead on the third day, just as the Scriptures said. ⁵ He was seen by Peter and then by the Twelve. ⁶ After that, he was seen by more than 500 of his followers at one time, most of whom are still alive, though some have died. ⁷ Then he was seen by James and later by all the apostles. ⁸ Last of all, as though I had been born at the wrong time, I also saw him. ⁹ For I am the least of all the apostles. In fact, I’m not even worthy to be called an apostle after the way I persecuted God’s church.
¹⁰ But whatever I am now, it is all because God poured out his special favor on me—and not without results. For I have worked harder than any of the other apostles; yet it was not I but God who was working through me by his grace. ¹¹ So it makes no difference whether I preach or they preach, for we all preach the same message you have already believed.

Examine the scriptures:

1 Corinthians 15:1-11
The Resurrection of Christ
¹ Let me now remind you,

This is not a new message.

Deuteronomy 6:7 (NLT)
Repeat them again and again to your children. Talk about them when you are at home and when you are on the road, when you are going to bed and when you are getting up.

Psalm 118:4 (NLT)
Let all who fear the Lord repeat:
“His faithful love endures forever.”

2 John 5 (NLT)
I am writing to remind you, dear friends, that we should love one another. This is not a new commandment, but one we have had from the beginning.

 Romans 15:15 (NLT)
Even so, I have been bold enough to write about some of these points, knowing that all you need is this reminder. 

 John 14:26 (NLT)
But when the Father sends the Advocate as my representative—that is, the Holy Spirit—he will teach you everything and will remind you of everything I have told you.

•  Good teaching includes repetition.
• We all need reminders.

 That’s why electronic calendar reminders are so popular.

 dear brothers and sisters, 

 1 Corinthians 1:2 (NLT)
 I am writing to God’s church in Corinth, to you who have been called by God to be his own holy people. He made you holy by means of Christ Jesus, just as he did for all people everywhere who call on the name of our Lord Jesus Christ, their Lord and ours.

• Paul is speaking to Christians. (He made you holy by means of Christ Jesus)

 of the Good News I preached to you before.

Refer to verse 3
The death and resurrection of Jesus.

You welcomed it then, and you still stand firm in it. 

 1 Corinthians 1:4 (NLT)
I always thank my God for you and for the gracious gifts he has given you, now that you belong to Christ Jesus.

 ² It is this Good News that saves you if you continue to believe the message I told you—

 unless, of course, you believed something that was never true in the first place.

• Not all “believers” are Christians.

Satan “believes” but he is not saved.

Matthew 7:21-23 (NLT)
²¹ “Not everyone who calls out to me, ‘Lord! Lord!’ will enter the Kingdom of Heaven. Only those who actually do the will of my Father in heaven will enter. ²² On judgment day many will say to me, ‘Lord! Lord! We prophesied in your name and cast out demons in your name and performed many miracles in your name.’ ²³ But I will reply, ‘I never knew you. Get away from me, you who break God’s laws.’

The test

John 8:31 (NLT)
Jesus said to the people who believed in him, “You are truly my disciples if you remain faithful to my teachings.

 1 John 2:24 (NLT)
So you must remain faithful to what you have been taught from the beginning. If you do, you will remain in fellowship with the Son and with the Father.

 2 John 9 (NLT)
Anyone who wanders away from this teaching has no relationship with God. But anyone who remains in the teaching of Christ has a relationship with both the Father and the Son.

 What is the message we must continue to believe?

³ I passed on to you what was most important and what had also been passed on to me. Christ died for our sins, just as the Scriptures said. ⁴ He was buried, and he was raised from the dead on the third day, 

 Christ died

Christ was raised from the dead.

just as the Scriptures said. 

Isaiah 53 (plus other O.T. passages)

Romans 10:9-10 (NLT)
⁹ If you openly declare that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. ¹⁰ For it is by believing in your heart that you are made right with God, and it is by openly declaring your faith that you are saved.

•  Christ died for our sins. He was buried, and he was raised from the dead on the third day.

It does not stop here.

Ephesians 4:20-24 (NLT)
²⁰ But that isn’t what you learned about Christ. ²¹ Since you have heard about Jesus and have learned the truth that comes from him, ²² throw off your old sinful nature and your former way of life, which is corrupted by lust and deception. ²³ Instead, let the Spirit renew your thoughts and attitudes. ²⁴ Put on your new nature, created to be like God—truly righteous and holy.

 Matthew 7:16 & 20 (NLT)
¹⁶ You can identify them by their fruit, that is, by the way they act. Can you pick grapes from thornbushes, or figs from thistles? ^… 20 Yes, just as you can identify a tree by its fruit, so you can identify people by their actions.

• Christians live changed lives.

⁵ He was seen by Peter and then by the Twelve. ⁶ After that, he was seen by more than 500 of his followers at one time, most of whom are still alive, though some have died. ⁷ Then he was seen by James and later by all the apostles. ⁸ Last of all, as though I had been born at the wrong time, I also saw him. 

• More than 500 people saw Jesus after he rose from the dead. 

⁹ For I am the least of all the apostles. In fact, I’m not even worthy to be called an apostle after the way I persecuted God’s church. 

¹⁰ But whatever I am now, it is all because God poured out his special favor on me—and not without results. For I have worked harder than any of the other apostles; yet it was not I but God who was working through me by his grace.  

¹¹ So it makes no difference whether I preach or they preach, for we all preach the same message you have already believed. 

Not the messenger but the message.

Repeat verse 3

³ I passed on to you what was most important and what had also been passed on to me. Christ died for our sins, just as the Scriptures said. ⁴ He was buried, and he was raised from the dead on the third day, just as the Scriptures said.