Haman min haTorah minayin? Chazal point to the pasuk in Parshas Braishis, "Ha’min ha’eitz … achalta?” What does G-d's question to Adam about his having eaten the forbidden fruit have to do with Purim?
Ksav Sofer explains that tshuvah is usually the product of reflection and remorse. Yet, sometimes we need a little push to get there. One might have had a hava amina that tshuvah of this sort doesn’t carry much weight – it’s not too hard to do soul searching when Haman’s decree or the threat of some other suffering is hanging over your head! Yet, we see from the story of the first sin in the Torah that Hashem doesn’t wait for us – Hashem reached out to Adam and asked him whether he ate from the forbidden fruit, inviting Adam to confess and own up to the crime. Haman min haTorah – the tshuvah elicited by the evil of Haman already has a precedent in the Torah.