ῥακά G4469
rhaká · rhak-ah' · Noun
of Chaldee origin (compare רֵיק); O empty one, i.e. thou worthless (as a term of utter vilification):--Raca.
1 Occurrence in the King James Bible
Matthew 5:22But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.