For the priests who bore the ark stood in the midst of Jordan, until every thing was finished that the LORD commanded Joshua to speak unto the people, according to all that Moses commanded Joshua: and the people hastened and passed over.
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George Leo Haydock
To him. Moses had been dead forty days. But it seems this miraculous division of the Jordan had been revealed to him, and he had cautioned Josue to let slip no opportunity of attaching the people to God's service, by erecting monuments of religion, as he did on this occasion. (Calmet)
Haste. Though they were assured by the divine promise, they experienced a certain fear. (Salien)
Even the most constant are liable to such impressions. (Matthew xiv. 30.)