"Now listen to them; but warn them solemnly and let them know what the king who will reign over them will claim as his rights." (NIV)
So listen now to their voice; only solemnly warn them and show them the ways of the king who shall reign over them. (AMP)
Now therefore hearken unto their voice: howbeit yet protest solemnly unto them, and shew them the manner of the king that shall reign over them. (KJV)