Numbers 20:27

And Moses did as the LORD commanded: and they went up into mount Hor in the sight of all the congregation.

And Moses did as the Lord commanded,.... Though it must be very cutting, distressing, and afflicting to him, to part with a brother so dear to him, and who had been so many years a companion of him, and a partner with him in the care and government of the people of Israel; but it being the Lord's will, he submits unto it, and faithfully and readily obeyed his orders, as he always did:

and they went up into mount Hor, in the sight of all the congregation; that is, Moses, Aaron, and Eleazar, and perhaps there might be some others that went with them as servants, to attend them and assist them in some things to be done, particularly in the burial of Aaron; they all saw Aaron go up, but he came down no more, and so it was ordered in this public manner, that they might be witnesses of the translation of the priesthood from Aaron to Eleazar, who, after this affair was over, came down with Moses.