It's a symbol of Jesus Christ’s burial and resurrection 1 Corinthians 15:3-4 (NLT) 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. 4He was buried, and he was raised from the dead on the third day, just as the Scriptures said.
Colossians 2:12 (NLT) For you were buried with Christ when you were baptized. And with him you were raised to new life because you trusted the mighty power of God, who raised Christ from the dead.
It’s a symbol of your new life as a Christian 2 Corinthians 5:17 (NLT) This means that anyone who belongs to Christ has become a new person. The old life is gone; a new life has begun!
Romans 6:4 (NLT) For we died and were buried with Christ by baptism. And just as Christ was raised from the dead by the glorious power of the Father, now we also may live new lives.
Ephesians 2:8-9 (NLT) God saved you by his grace when you believed. And you can’t take credit for this; it is a gift from God. 9Salvation is not a reward for the good things we have done, so none of us can boast about it.
Romans 10:9-10 (NLT) If you openly declare that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. 10For 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.