Thus saith the Lord — The scope of this and the next chapter, is to vindicate God's justice and to convince the Jews that they were the causes of their own calamities. Behold — You can blame none but yourselves and your own sins, for all your captivities and miseries.
Related Commentaries of Isaiah 50:1
Isaiah 50:1
1 Thus saith the LORD, Where is the bill of your mother's divorcement, whom I have put away? or which of my creditors is it to whom I have sold you? Behold, for your iniquities have ye sold yourselves, and for your transgressions is your mother put away.