'Here Am I' in the Bible

Behold, here am I, sayeth the LORD, against the prophets that take upon their tongues to speak: The LORD hath said it.

Behold, here am I, sayeth the LORD, against those prophets that dare prophesy lies, and deceive my people with their vanities, and miracles, whom I never sent, nor commanded them. They shall do this people great harm, sayeth the LORD.