John Gills Exposition of the Bible Commentary - Isaiah 37:21
Then Isaiah the son of Amoz sent unto Hezekiah, saying ,.... Isaiah, by a spirit of prophecy, was made acquainted by the Lord both with the prayer of Hezekiah, and the Lord's answer to it; and therefore immediately sent to the king, who was either at the temple praying, or was returned to the palace, to let him know, the mind of the Lord in this matter. The Septuagint and Syriac versions render it, "and Isaiah the son of Amoz was sent to Hezekiah"; but this does not agree with the Hebrew... read more
Matthew Henry's Complete Commentary - Isaiah 37:21-38
We may here observe, 1. That those who receive messages of terror from men with patience, and send messages of faith to God by prayer, may expect messages of grace and peace from God for their comfort, even when they are most cast down. Isaiah sent a long answer to Hezekiah's prayer in God's name, sent it in writing (for it was too long to be sent by word of mouth), and sent it by way of return to his prayer, relation being thereunto had: ?Whereas thou hast prayed to me, know, for thy comfort,... read more