Isaiah 39:3

Then came Isaiah - Isaiah was accustomed to declare the will of God most freely to monarchs (see Isaiah 7)

What said these men? - What proposition have they made? What is the design of their coming? It is implied in the question that there had been some improper communication from them. To this question Hezekiah returned no answer.

And from whence came they? - It was doubtless known in Jerusalem that ambassadors had come, but it would not be likely to be known from what country they had come.

From a far country - Probably this was said in order to palliate and excuse his conducts, by intimating to the prophet that it was proper to show respectful attention to foreigners, and that he had done nothing more than was demanded by the laws of hospitality and kindness.