For the priests bearing the ark stood in the midst of the Jordan until everything was finished that the LORD commanded Joshua to tell the people, according to all that Moses had commanded Joshua. The people passed over in haste.
10. For the priests which bare, etc If we are ordered to halt while others are hastening, we know how easily a feeling of irksomeness is produced, because we seem to be occupying an inferior position. The priests, therefore, are justly praised for their patience in calmly remaining alone at their post, while the whole people were swiftly hurrying on to the further bank.
The inspired historian seems to be so well pleased with his subject here that he is loth to quit it, and is therefore very particular in his narrative, especially in observing how closely Joshua pursued the orders God gave him, and that he did nothing without divine direction, finishing all that the Lord had commanded him (v. 10), which is also said to be what Moses commanded.
Commenting on Joshua 4:10-19
For the priests which bare the ark stood in the midst of Jordan,.... Though on dry ground, the waters being divided: until everything was finished that the Lord commanded Joshua to speak unto the people, according to all that Moses commanded Joshua; that is, until all the people had passed over Jordan, as the Lord had ordered Joshua, to encourage them unto, and go over...