NET
17 For God has put into their minds to carry out his purpose by making a decision to give their royal power to the beast until the words of God are fulfilled.
Darby
17 for God has given to their hearts to do his mind, and to act with one mind, and to give their kingdom to the beast until the words of God shall be fulfilled.
KJV
17 For God hath put in their hearts to fulfil his will, and to agree, and give their kingdom unto the beast, until the words of God shall be fulfilled.