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Brilliant! I've never known "жрец" and "жертва" are etymologically related.
But I checked wiktionary жрец — Викисловарь - you are right!

Moreover, among others, this Indo-European root is also...

Although your version is not wrong :)

The word "жертва" in Russian can mean both "victim" and "sacrifice".

The logic is the following:

When someone suffers of something, then he/she is...