How is “make no mistake” used?

In The Omen (1976), one line is: “This is not a human child. Make no mistake.”

Which movie is “make no mistake” from?

The clip at the top of this page is from The Omen (1976).

used to emphasize what you are saying, especially when you want to warn sb about sth

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used to emphasize what you are saying, especially when you want to warn sb about sth
This is not a human child. Make no mistake.

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

This is not a human child. Make no mistake.

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