New Defender's Study Bible Notes
38:5 say to Hezekiah. Although Isaiah 38:1-6 is very much the same as II Kings 20:1-6, Isaiah 38:7-22 is different from II Kings 20:7-11. Then II Kings 20:12-19 essentially repeats Isaiah 39.
38:8 shadow of the degrees. For more details of Hezekiah’s healing and the miracle of the degrees, see II Kings 20:7-11.
38:20 sing my songs. On the possibility that these songs of Hezekiah have been preserved in the book of Psalms, see notes on Psalms 120–134. The fifteen songs of degrees may correspond to the fifteen years added to Hezekiah’s life.