What is an Ambassador for Christ?

World English Dictionary defines “ambassador” as: 1. short for ambassador extraordinary and plenipotentiary; a diplomatic minister of the highest rank, accredited as permanent representative to another country or sovereign  2. ambassador extraordinary a diplomatic minister of the highest rank sent on a special mission  3. ambassador plenipotentiary a diplomatic minister of the first rank with treaty-signing powers.

These definitions truly describe us as an ambassador for Christ.

Jesus sent the church on a special mission when He said,

"Go ye into all the world, and preach the gospel to every creature." - Mark 16:15 KJV

Jesus gave the church treaty-signing powers when He said,

"Whose soever sins ye remit, they are remitted unto them; and whose soever sins ye retain, they are retained." - John 20:23 KJV

On the day of Pentecost, the church began its mission and used its treaty-signing powers. 3000 received Peter's gospel message of the death, burial, and resurrection of Jesus, then repented, were baptized in the name of Jesus, and baptized with the Holy Ghost. (1 Corinthians 15:1-4, Romans 6:1-4).

After preaching the gospel, Peter preached how to obey the gospel.

"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 2:38 KJV

"And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation." - Acts 2:40 KJV

"Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls." - Acts 2:41 KJV

There was a treaty made: they were reconciled to God by repentance, baptism in the name of Jesus, and receiving the gift of the Holy Ghost.

"And all things are of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation; to wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation. [According to Thayer’s Greek Lexicon, “word of reconciliation” is “preaching.”]

“Now then we are ambassadors for Christ, as though God did beseech you by us: we pray you in Christ's stead, be ye reconciled to God." - 2 Corinthians 5:18-20 KJV