2 Kings 17:27

one of the priests whom ye brought from thence The Assyrian king takes what he would believe to be the best step towards remedying the mischief. A priest of the Israelitish worship was clearly the right person to be sent. No doubt all the priests were among the population that had been carried away. Hence the few Israelites left behind would not be regarded as capable of instructing the new colonists. For among the heathen, -the manner", i.e. the ceremonial and particular observances in performing worship, was the matter of highest import. The less spiritual the worship, the more it tends to lay weight on the -manner" and mode of the worship. Hence the magnificence so usual in idolatrous countries. The LXX. does not represent the words -one of the priests".

let them go The priest would not be expected to go alone. For such services as the king of Assyria had in his thoughts the person ministering must be attended by a body of minor people to add grandeur to the ceremonies.

and let him teach The priest would naturally be the teacher. Hence we can see the reason of the change of number in the pronouns in this clause and the last.