The Gemora in Kesubos says that covering the hair is de’Oraysa!!(there are additional Halochos de’Rabbonon about that, but the ikar is min ha’Torah)
Rabbiofberlin , maybe, you want to melamed ze’chus on the Jews of Bais Rishon by saying that avoda zara is not me’de’Oraysa??
Chibuk ve’nishuk is negia shel chiba, for example.