'Apostleship' in the Bible

We have received grace and apostleship through Him to bring about the obedience of faith among all the nations, on behalf of His name,

If I am not an apostle to others, at least I am to you, for you are the seal of my apostleship in the Lord.

since the One at work in Peter for an apostleship to the circumcised was also at work in me for the Gentiles.