Strong's Concordance G4469

Original Word: ῥακά
Transliteration: rhaká
Phonetic Spelling: rhak-ah'
[ῥακά] of Chaldee origin (compare H7386); O empty one, i.e. thou worthless (as a term of utter vilification)

Usages throughout the bible

Matthew 5:22 - But 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, G4469 shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.