Jeremiah 29:27

Now therefore why hast thou not reproved Jeremiah of Anathoth, which maketh himself a prophet to you?

The challenge comes from within a written exchange sent between Jerusalem and the exiles in Babylon. It belongs to the controversy over prophetic authority, with Jeremiah standing as the genuine prophet against rival claimants who opposed his message. The setting is the Babylonian captivity, when competing voices claimed to speak for God to the captive community.