Isaiah 53 is a famous Messianic prophecy of Christ in the Bible, hundreds of years before Christ was born His death and the meaning of what His death accomplished is taught in this chapter.
Yet someone said the following:
God didn’t crush His own Son. At least that’s not whats found in the Septuagint of Isaiah 53:10, which is what the Apostles used.
Septuagint is the Greek translation of the Old Testament.
This individual also said this:
The Apostles couldn’t have used the masoretic text because it didn’t exist yet.
The Masoretic text refers to the Hebrew medieval manuscripts of the Old Testament.
Before answering here’s what the New American Standard Bible says for Isaiah 53:10=
But the Lord was pleased To crush Him, putting Him to grief; If He would render Himself as a guilt offering, He will see His offspring, He will prolong His days, And the good pleasure of the Lord will prosper in His hand.
I think the phrase “the Lord was pleased To crush Him” is part of what Isaiah 53:10 contrary to what the person said in his comment. Here’s my response: