Contradiction with 1 Kings 18:40
This verse speaks of executing prophets of Baal, which contradicts the preservation and protection of prophets found in 1 Samuel 19:20.
1 Kings 18:40: And Elijah said unto them, Take the prophets of Baal; let not one of them escape. And they took them: and Elijah brought them down to the brook Kishon, and slew them there. [Take: or, Apprehend]
Contradiction with Jeremiah 26:23
This verse mentions a true prophet being put to death, contrasting with 1 Samuel 19:20, where prophecies offer protection.
Jeremiah 26:23: And they fetched forth Urijah out of Egypt, and brought him unto Jehoiakim the king; who slew him with the sword, and cast his dead body into the graves of the common people. [common...: Heb. sons of the people]
Contradiction with Hosea 9:8
The prophet is described as a snare or trap, contrasting with 1 Samuel 19:20, which presents prophets in a positive light.
Hosea 9:8: The watchman of Ephraim [was] with my God: [but] the prophet [is] a snare of a fowler in all his ways, [and] hatred in the house of his God. [in the: or, against the]