In prison. Josephus ('Antiq.,' 18.5, 2) informs us that this prison was the fort of Machaerus, on the confines of Galilee and Arabia, and that there John was beheaded. Herod's father had built a magnificent palace within that fort; and so he may have been keeping the anniversary of his birthday there,
For John said unto Herod. The Greek tense ( ἔλεγε) implies more than the simple expression, "he said;" it implies a repeated warning. We learn from St. Matthew (Matthew 14:5) that Herod would have killed John before, but he feared the people. Here St. Mark says that Herodias set herself against him, and desired to kill him; and she could not; for Herod feared John. There is no contradiction between the two evangelists. The case appears to have been this: that at first Herod desired to put John to death, because John had reproved him on account of Herodias. But by degrees John gained an influence over Herod by the force of his character, and by his holy life and teaching.