Paul wanted to reach the Jews with the gospel. Acts16:3. Acts18. Acts21.
Those under the law. The religious leaders. Luke 11:46. Ephesians 2:8-9. Salvation by faith alone.
Those outside the law. Gentiles, atheists etc.
The weak. Physically weak, neglected by society.
Why did Paul rebuke Peter? Ephesians 2:7-14.
Your heavenly crown is the result of you being the instrument in sharing the gospel.
Be a friend to the unsaved.