Believeth and is Baptized

 

Jesus appeared to His disciples after His resurrection.

"And he said unto them, Go ye into all the world, and preach the gospel to every creature. He that believeth and is baptized shall be saved; but he that believeth not shall be damned." - Mark 16:15 -16 

He that believeth what?

He that believeth the GOSPEL. (Mark 16:15).

What is the gospel?

"Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. [without effect]

"For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; and that he was buried, and that he rose again the third day according to the scriptures:" - 1 Corinthians 15:1-4 

To be saved, we not only need to believe the gospel, we must also obey the gospel by being baptized -  "He that believeth and is baptized shall be saved..."

Jesus said, "Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God." - John 3:5 

Peter preached the gospel on the Day of Pentecost.

"Now when they heard this, they were pricked in their heart, and said unto Peter and to the rest of the apostles, Men and brethren, what shall we do?"

"Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost." - Acts 2: 37-38. 

"But when they believed Philip preaching the things concerning the kingdom of God, and the name of Jesus Christ, they were baptized, both men and women." - Acts 8:12 

"In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ:" - 2 Thessalonians 1:8 

"For the time is come that judgment must begin at the house of God: and if it first begin at us, what shall the end be of them that obey not the gospel of God?" - 1 Peter 4:17 

"But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report?" - Romans 10:16 

(Also Acts 16:31-33, Acts 19:4-6).