The Apostle Paul
2 Corinthians 5:20 We are therefore Christ's ambassadors, as though God were making his appeal through us. We implore you on Christ's behalf: Be reconciled to God.

Ambassador; diplomatic representative: a diplomatic official of the highest rank sent by one country as its long-term representative to another

Philippians 3:5-8 circumcised on the eighth day, of the people of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; in regard to the law, a Pharisee; as for zeal, persecuting the church; as for legalistic righteousness, faultless. But whatever was to my profit I now consider loss for the sake of Christ. What is more, I consider everything a loss compared to the surpassing greatness of knowing Christ Jesus my Lord, for whose sake I have lost all things. I consider them rubbish, that I may gain Christ

The apostle Paul counted his earthly heritage as loss so that he could represent the heavenly Israel as an ambassador.

Philippians 3:14,15 I press on toward the goal to win the prize for which God has called me heavenward in Christ Jesus. All of us who are mature should take such a view of things. And if on some point you think differently, that too God will make clear to you.

Philippians 3:20 But our citizenship is in heaven. And we eagerly await a Savior from there, the Lord Jesus Christ,

Paul writing by inspiration of the Holy Spirit has been declared an ambassador for God. Paul is declaring that his homeland is the Israel in heaven and is pleading with us to be of the same mind. An ambassador is not a permanent resident, merely a representative of his homeland.

Hebrews 11:13-16 All these people were still living by faith when they died. They did not receive the things promised; they only saw them and welcomed them from a distance. And they admitted that they were aliens and strangers on earth. People who say such things show that they are looking for a country of their own. If they had been thinking of the country they had left, they would have had opportunity to return. Instead, they were longing for a better country--a heavenly one. Therefore God is not ashamed to be called their God, for he has prepared a city for them.