The first 6 verses of Hebrews 3 compare and contrast Jesus with Moses. First, the comparison in verses 1-2.
We begin with identification of Jesus as the Apostle and High priest of our confession. Notice the definite article. He is ‘the’ Apostle — a delegate or ambassador. In these last days, Jesus was the One (the only One) sent to man by God. He is also the only High Priest of the New Covenant, of the order of Melchizedek, (cf. Hebrews 6:20). He is the only high priest needed. “Therefore He is also able to save to the uttermost those who come to God through Him, since He always lives to make intercession for them” (Hebrews 7:25).
Like Moses, Jesus was “faithful to Him who appointed Him” (2). He Himself said, “I can of Myself do nothing. As I hear, I judge; and My judgment is righteous, because I do not seek My own will but the will of the Father who sent Me” (John 5:30). Moses was faithful as well, living his life in service to Jehovah. There are differences between the two, but as stewards, fulfilling God’s desire for them, they were certainly alike in their faithfulness to execute God’s will!