From the Concordance in the back of my Bible

Baptism
coming to his b . . Matt 3:7
b that I am baptized . . Matt 20:22
“But I have a b . . Luke 12:50
said, “Into John’s b . . Acts 19:3
Lord, one faith, one b . . Eph 4:5
buried with Him in b . . Col 2:12

Baptism
of the doctrine of b . . Heb 6:20

Baptize
“I indeed b you with . . Matt 3:11
Himself did not b . . John 4:2

Baptized
b will be saved . . Mark 16:16
every one of you be b . . Acts 2:38
all his family were b . . Acts 16:33
Arise and be b . . Acts 22:16
were b into Christ . . Rom 6:3
I thank God that I b . . 1 Cor 1:14
Spirit we were all b . . 1 Cor 12:13

Baptizing
b them in the name of . . Matt 28:19

What are some of the key verses, we have One Lord, One Faith, One Baptizm (Eph 4:5).  We have been buried with Christ in Baptism (Col 2:12, Rom 6:3).  We are saved in baptism (Mark 16:16, Acts 2:38, Acts 22:16), not that baptism saves us but that that is the time God has chosen to bestow salvation upon us.  We should baptize in the name of the Father, Son, and Holy Spirit (Matthew 28:19)

Is there any kind of an old Testament example of this, something we can relate to?  Some would say circumcision.  Which is the old testament size of faith.

I would point to another story in 2 Kings 5 where Naaman has leprosy and is told by the prophet Elisha to go and wash in the Jordan.

2 Kings 5:10 And Elisha sent a messenger to him [Naaman], saying, “Go and wash in the Jordan seven times, and your flesh shall be restored to you, and you shall be clean.”

He is healed, was it washing in the Jordan that healed him, NO!  It was his obedience to the Lord, even if that was a reluctant obedience none the less. It was his washing, or dipping, into the Jordan Seven times.

Today God commands us to Repent and be Baptized to be saved.  Baptism does not save us, it is the time God has chosen to bestow His Grace upon us.  Trust in Him and His Word to be saved.