Reference for Isaiah 38:15

מָֽה־אֲדַבֵּ֥ר וְאָֽמַר־לִ֖י וְה֣וּא עָשָׂ֑ה אֶדַּדֶּ֥ה כָל־שְׁנוֹתַ֖י עַל־מַ֥ר נַפְשִֽׁי׃

What shall I say? He hath both spoken unto me, and Himself hath done it; I shall go softly all my years for the bitterness of my soul.