Fourth Book of Kings (Author Compiled by Isaias and Jeremias from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
19:3qui dixerunt haec dicit Ezechias dies tribulationis et increpationis et blasphemiae dies iste venerunt filii usque ad partum et vires non habet parturiens
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.