Charles Ellicott Commentary Isaiah 51:19

"These two things are befallen thee, who shall bemoan thee? desolation and destruction, and the famine and the sword; how shall I comfort thee?" — Isaiah 51:19 (ASV)

These two things ... —The two things are amplified into four: (1) the two effects, and (2) the two causes.

Who shall be sorry for thee? —Better, Be sorry with you, or who will console you? Even Jehovah is represented as failing, or seeming to fail, in finding a comforter for such affliction.