He’s traditionally seen as one of apostle Paul’s fellow servants or helpers, and died a martyr’s death around 61 A.D. The letter that bears his name could of been written then by him or even around 130 A.D. Nothing is known for certain. Nevertheless the importance of it is that it reports the need of the sacrifice of Christ along with baptism in His name, prayer and sanctification unto righteousness. The early church fathers never mentioned a trinity nor of any baptism other than the one recorded in the book of Acts, which is in the name of the Lord Jesus Christ for the remission of sins. The Didache (The supposed teachings of the apostles written around the year 140 A.D.) mentions baptism in the name of the Lord (Jesus), but also a later addition speaks of one into the titles of the father, son and Holy Ghost. Regardless, the baptism in the name of Jesus is the one baptism unto salvation by the apostle Paul in the book of Ephesians. In fact he bears record that any change from his baptismal formula (and he baptized many in that name – see Acts 16:15, 33; 18:8; 19:1-5; 22:16; 1 Corinthians 1:1-25; Romans 6:1-5; Galatians 3:26-28: Colossians 2:10-12; 3:17, ect) is cursed in Galatians 1:6-12. Jesus said that man was to live by every word of God, and that by our own words we would be justified or condemned. If one can only heal, cast out demons and do many wonderful works in His name, why would you want to use any other? Jesus died for your sins and not another. He alone has all power or authority in heaven and in the earth. His name is the only way to God. It was commanded for use in all things. Some say that the titles mean the same thing but if so why did not the apostles use them. Not ever did they do so. It was that important to them. And so it should be to us if we wish to earnestly contend for the faith that was once shown by His early church.
Barnabas 11:1 But let us enquire whether the Lord took care to signify before hand concerning the water and the cross. Now concerning the water it is written in reference to Israel, how that they would not receive the baptism which bringeth remission of sins, but would build for themselves.
Ye perceive how He pointed out the water and the cross at the same time. For this is the meaning; Blessed are they that set their hope on the cross, and go down into the water; for He speaketh of the reward at his proper season; then, saith He, I will repay. But now what saith He? His leaves shall not fall off; He meaneth by this that every word, which shall come forth from you through your mouth in faith and love, shall be for the conversion and hope of many. And again another prophet saith; And the land of Jacob was praised above the whole earth. He meaneth this; He glorifieth the vessel of His Spirit. Next what saith He? And there was a river streaming from the right hand, and beautiful trees rose up from it; and whosoever shall eat of them shall live forever. This He saith, because we go down into the water laden with sins and filth, and rise up from it bearing fruit in the heart, resting our fear and hope on Jesus in the spirit. And whosoever shall eat of these shall live forever; He meaneth this; whosoever, saith He, shall hear these things spoken and shall believe, shall live forever.
But let us enquire whether there be any temple of God. There is; in the place where he himself undertakes to make and finish it. For it is written And it shall come to pass, when the week is being accomplished, the temple of God shall be built gloriously in the name of the Lord. I find then that there is a temple, How then shall it be built in the name of the Lord? Understand ye. Before we believed on God, the abode of our heart was corrupt and weak, a temple truly built by hands; for it was full of idolatry and was a house of demons, because we did whatsoever was contrary to God. But it shall be built in the name of the Lord. Give heed then that the temple of the Lord may be built gloriously. How? Understand ye. By receiving the remission of our sins and hoping on the Name we became new, created afresh from the beginning. Wherefore God dwelleth truly in our habitation within us. How? The word of his faith, the calling of his promise, the wisdom of the ordinances, the commandments of the teaching, He Himself prophesying in us, He Himself dwelling in us, opening for us who had been in bondage unto death the door of the temple, which is the mouth, and giving us repentance leadeth us to the incorruptible temple. For he that desireth to be saved looketh not to the man, but to Him that dwelleth and speaketh in him, being amazed at this that he has never at any time heard these words from the mouth of the speaker, nor himself ever desired to hear them. This is the spiritual temple built up to the Lord.
So far as it was possible with all simplicity to declare it unto you, my soul hopeth that I have not omitted anything [of the matters pertaining unto salvation and so failed in my desire].
Be not thou found holding out thy hands to receive, and drawing them in to give. Thou shalt love as the apple of thine eye every one that speaketh unto thee the word of the Lord. Thou shalt remember the day of judgment night and day, and thou shalt seek out day by day the persons of the saints, either laboring by word and going to exhort them and meditating how thou mayest save souls by thy word, or thou shalt work with thy hands for a ransom for thy sins. Thou shall not hesitate to give, neither shalt thou murmur when giving, but thou shalt know who is the good paymaster of thy reward. Thou shalt keep those things which thou hast received, neither adding to them nor taking away from them. Thou shalt utterly hate the Evil One. Thou shalt judge righteously. Thou shalt not make a schism, but thou shalt pacify them that contend by bringing them together. Thou shalt confess thy sins. Thou shalt not betake thyself to prayer with an evil conscience. This is the way of light.