put My words in thy mouth. See note on Isaiah 50:4 ("that. should know"). Reference to Pentateuch (Deuteronomy 18:18). App-92.
that: i.e. in order that.
Related Commentaries of Isaiah 51:16
Isaiah 51:16
16 And I have put my words in thy mouth, and I have covered thee in the shadow of mine hand, that I may plant the heavens, and lay the foundations of the earth, and say unto Zion, Thou art my people.