Hebrews 3:5-6

‘And Moses indeed was faithful in all his house as a servant, for a testimony of those things which were afterward to be spoken, but Christ (Messiah) as a son, over his house.’

So, he declares, Moses was indeed great. As the servant of Yahweh (one who ‘renders willing service’ - therapon) he was faithful in his responsibilities to the nation from which he sprang, and from which he was called by God in order to be over them. And it was as so faithful that he gave forth a testimony of the things which were to be afterwards spoken, that is, of God’s Instruction and God’s covenant, and was a mediator in establishing that covenant, and could testify to all that was connected with it, and as to what was its true meaning. Truly Moses was great. He was the great Lawgiver, the great revealer of God’s ways, the great spokesman. He was the great Trek leader who called God’s people and both initiated and then led the great Trek towards deliverance. But another (Joshua, but even he failed - Hebrews 4:8) completed the Trek for he proved insufficient. And his insufficiency was demonstrated in that he pointed ahead to another yet to come, another like himself (Deuteronomy 18:18-19), and to a vision of a greater future (Genesis 49:10-12; Numbers 24:17). He did not see himself as the be all and end all. Everything did not point to him

For even greater than Moses was the Messiah. He, as the writer has already revealed, was not a servant in the house but a Son over His house. He came not from the wilderness but from Heaven. He is the One, as he has already demonstrated, Who works all things on behalf of the house, He is their Source and Trek Leader from the beginning who will complete the Trek by bringing many sons to glory, He is their Sanctifier, their High Priest, and their Saviour, and in a unique sense their Elder Brother, and all as One Who as Son came from God. He is not of the house, but One Who is established over the house, that He might save them and thereby make them His house by uniting Himself with them.