John 3:24

For at this time John had not been put into prison.

Matthew 4:12

Now when it came to his ears that John had been put in prison, he went away to Galilee;

Matthew 14:3

For Herod had taken John and put him in prison because of Herodias, his brother Philip's wife.

Mark 6:17

For Herod himself had sent men out to take John and put him in prison, because of Herodias, his brother Philip's wife, whom he had taken for himself.

Luke 3:19-20

But Herod the king, because John had made a protest on account of Herodias, his brother's wife, and other evil things which Herod had done,

Luke 9:7-9

Now Herod the king had news of all these things: and he was in doubt, because it was said by some people that John had come back from the dead;

Treasury of Scripture Knowledge

Summary

For John was not yet cast into prison.

Bible References

General references

Matthew 4:12
Now when it came to his ears that John had been put in prison, he went away to Galilee;
Matthew 14:3
For Herod had taken John and put him in prison because of Herodias, his brother Philip's wife.
Mark 6:17
For Herod himself had sent men out to take John and put him in prison, because of Herodias, his brother Philip's wife, whom he had taken for himself.
Luke 3:19
But Herod the king, because John had made a protest on account of Herodias, his brother's wife, and other evil things which Herod had done,
Luke 9:7
Now Herod the king had news of all these things: and he was in doubt, because it was said by some people that John had come back from the dead;

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain