For the source text click/tap here: Zevachim 24
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Rabbah bar bar Chanah quotes Rabbi Yochanan saying that anytime the verse uses the term “finger” and “Kohen,” it must be done with the right hand. The Gemora first assumes that both terms must be present to require the right, as the verse about the chatas uses both – and the Kohen will take from the chatas blood with his finger – and we learn that verse from the verse about a metzora, which explicitly refers to the right finger.
The Gemora challenges this, since kemitzah – scooping the minchah only mentions “Kohen,” yet the Mishna states that if a Kohen did it with his left hand it is invalid. Therefore, Rava says that Rabbi Yochanan means any verse that uses either term implies the right.
We explore handedness in Halacha and mythology of antiquity.