The living, the living. Figure of speech Epizeuxis, for emphasis, implying that only such are able to praise.
the father to the children. Note the reference to the Pentateuch (Deuteronomy 4:9; Deuteronomy 6:7).
children. sons.
Related Commentaries of Isaiah 38:19
Isaiah 38:19
19 The living, the living, he shall praise thee, as I do this day: the father to the children shall make known thy truth.