In ancient Middle Eastern culture, authorized servants were often empowered to act on behalf of and in the name of their masters. One example of this is Abraham sending his servant to find a wife for Isaac (Genesis 24:1-9). Significantly, although scholars believe the servant was Eliezer of Damascus, he is not named.1 When he goes to negotiate on behalf of Abraham, it is as if he were Abraham.
This divine investing of one's name/authority in an authorized representative is also present in Jesus' teachings in the New Testament (Matthew 10:40; John 5:43).
1 New Living Translation Study Bible (Carol Stream, IL: Tyndale House Publishers, Inc., 2008), Ge 24:1–9.