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^D5985 of the heavens concerning this secret; that Daniel and his companions should not perish with the rest of the wise men of Babylon.

Darby Bible Notes

God - Elah, corresponding to the Hebrew Eloah; and so throughout to end of ch. 7.

KJV

18 That they would desire mercies of the God^K5887of heaven concerning this secret; that Daniel and his fellows should not perish^K5888with the rest of the wise [men] of Babylon.

KJV Bible Notes

of the God: Cald. from before God. should not perish: Or, that they should not destroy Daniel, etc..