When we repent of our sins and are baptized in Jesus name for the remission of sins, our sinful nature - the lusts of the flesh - is cut off. (Acts 2:38, Galatians 5:24)

Our baptism in Jesus name is a blood covenant. The blood that Jesus shed for the remission of our sins (the cutting off of our sins) is applied to our life. (Revelation 1:5, Matthew 26:28)

At water baptism we are given the name of Jesus. (Acts 15:17, James 2:7)

If we are not baptized in Jesus name, we are cut off from the people of God. (Mark 16:16)

Peter compares our water baptism with the eight souls on Noah’s ark. He says just as those eight souls were saved by water, we too are saved by water by water baptism in Jesus name. (1Peter 3:20-21)

It is said the number seven symbolizes perfection – perfection that is achievable via natural means – while eight symbolizes that which is beyond nature, above and beyond this world (in the spiritual realm). Peter tying the number eight to baptism reminds us that baptism in Jesus name is above and beyond this world, in the spiritual realm.

Our water baptism in Jesus name is compared to circumcision. (Colossians 2:11-12)

All the features of the covenant of circumcision correlate with our covenant of water baptism in Jesus name.

In circumcision, the flesh is cut off. (Genesis 17:11) Circumcision has the legal requirement that at least one drop of blood is to be shed in the procedure. It is considered a blood covenant. (Genesis 17:11) At circumcision, the child is given his name. (Luke 2:21) If circumcision is not administered, his soul is considered cut off from the Jewish people. (Genesis 17:14)

When God first commanded circumcision to Abram, God changed his name to Abraham.

The Hebrew letter that God added to Abram’s name is the same letter that occurs twice in God’s name Yahweh. This name is called the tetragamaton because it is the four Hebrew letters – “yud,” “hey,” “vav,” “hey.” It is the letter “hey” that was added to Abram to make it Abraham. God shared His name with Abraham at circumcision, just as He shares His name Jesus with us at baptism in Jesus name.

The Hebrew form of the name Jesus – Yĕhowshuwa,` translated as Joshua (Exodus 17:9), shares three letters from the tetragrammaton - the "yud", the "hey", and the "vav." The root of the name Joshua (Greek - Jesus) is from the tetragrammaton (Yahweh) along with the word "to save, deliver."

(https://www.blueletterbible.org/lang/lexicon/lexicon.cfm?Strongs=H3091&t=KJV)

The name Jesus is interchanged for the name Joshua in Acts 7:45 and Hebrews 4:8.

Circumcision is to be administered when an infant is eight days old.

When God commanded Abraham to be circumcised, Abraham was circumcised the selfsame day. (Genesis 17:23, Genesis 17:26) This shows the importance to not delay obeying God’s command of such an important covenant.

The disciples likewise did not delay in water baptizing in Jesus name.

When those that heard the gospel received it, they were baptized the selfsame day. (Acts 2:41, Acts 8:36-38, Acts 9:17-18, Acts 10:47-48, Acts 16:33, Acts 19:5)

Acts 22:16 KJV - And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.