2 Chronicles 18:5
Then the king of Israel gathered the prophets together, four hundred of them, and said to them, 'Shall we go to Ramoth-gilead to battle, or shall I refrain?' And they said, 'Go up; for God will give it into the hand of the king' — Ahab assembled 'four hundred prophets' (וַיִּקְבֹּץ מֶלֶךְ יִשְׂרָאֵל אֶת־הַנְּבִיאִים אַרְבַּע־מֵאוֹת) who unanimously advised war (עֲלוּ כִּי־יִתְּנָהּ אֱלֹהִים בְּיַד־הַמֶּלֶךְ). The prophetic consensus was unanimity—a theological red-flag indicating false prophecy or manipulation.