Isaiah 51:22 [KJV] says:
'Thus saith thy Lord the LORD, and thy God that pleadeth the cause of his people, Behold, I have taken out of thine hand the cup of trembling, even the dregs of the cup of my fury; thou shalt no more drink it again;'
Isaiah 51:22 [JPS] says:
'Thus said the LORD, your Lord,
Your God who champions His people:
Herewith I take from your hand
The cup of reeling,
The bowl, the cup of My wrath;
You shall never drink it again.'
Who is it that pleads the cause of His people? Who is it that champions His people?
Who is it that says, 'Behold, I have taken out of thine hand the cup of trembling'?
Who is it that says, Herewith I take from your hand the cup of reeling [dire fate]?
We know from Psalm 110:1 that a distinction is made between 'the LORD' and 'my Lord'. The LORD (of Psalm 110) speaks to David's Lord and says, 'Sit thou at my right hand, until I make thine enemies thy footstool.' So, this is clearly not an ordinary man, or even the 'son of David' by human procreation.
Matthew 26:39 tells us who takes the cup. 'And he [Jesus] went a little further, and fell on his face, and prayed, saying, O my Father, if it is possible, let this cup pass from me: nevertheless not as I will, but as thou wilt.'
IMO, there can be no doubt that Jesus Christ is OUR Lord, and that he comes from God, as the salvation of God. It is he that brings salvation, taking away the cup of wrath. Do you agree?
Isaiah 52:7. 'How beautiful upon the mountains are the feet of him that bringeth good tidings, that publisheth peace; that bringeth good tidings of good, that publisheth salvation; that saith unto Zion, Thy God reigneth!'