Matthew 23:7-8

23:7 and elaborate greetings ¹  in the marketplaces, and to have people call them ‘Rabbi.’ 23:8 But you are not to be called ‘Rabbi,’ for you have one Teacher and you are all brothers.

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¹ sn There is later Jewish material in the Talmud that spells out such greetings in detail. See H. Windisch, TDNT 1:498.