The Gospel is literally the good news of God coming to earth as a man to die for our sins, not the literal words of the Bible. It's this message that is to be shared, not necessarily the exact words on the page, especially because it's going to be translated anyway.
But the Bible does promise that it will be preserved to the letter regardless:
Isaiah 40:8
The grass withereth, the flower fadeth: but the word of our God shall stand for ever.
Matthew 5:18
For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
But the Bible does promise that it will be preserved to the letter regardless:
Isaiah 40:8
The grass withereth, the flower fadeth: but the word of our God shall stand for ever.
Matthew 5:18
For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.