NET
18 He asked them to pray for mercy from the God of heaven concerning this mystery so that he and his friends would not be destroyed along with the rest of the wise men of Babylon.
Darby
18 that they would desire mercies of the God of the heavens concerning this secret; that Daniel and his companions should not perish with the rest of the wise men of Babylon.
KJV
18 That they would desire mercies of the God of heaven concerning this secret; that Daniel and his fellows should not perish with the rest of the wise [men] of Babylon.