What does Daniel 6:16 mean?
Darius could procrastinate no longer (Daniel 6:14–15). The trap sprung by jealous rivals (Daniel 6:4–5) was impossible to overturn by legal means (Daniel 6:6–9, 12–13). Since Daniel had deliberately violated the law (Daniel 6:10–11), the king was obligated to order his advisor be locked into a cell with lions. Since he would not counter his own culture's laws, Darius was powerless to save Daniel. Yet he acknowledges that Daniel is faithful to God. The pagan king appeals to that Lord for Daniel's rescue.Daniel's loyalty to the God of Israel impressed Darius. He had seen consistency in Daniel's commitment. Perhaps Darius heard the story of Daniel's three friends who survived a fiery death when Nebuchadnezzar was king (Daniel 3:24–26). No one should doubt the impact a believer's consistent testimony can have on an unbeliever, even one hardened against faith (James 5:10; 1 Peter 3:16).
This form of execution probably used a closed cave or manmade enclosure holding lions captured for this very purpose. The structure might have had multiple doors, including one on the top so that victims could be literally "thrown" in without the lions escaping or attacking the executioners (Daniel 6:17, 24).