Now we command you, brothers, in the name of our Lord Jesus Christ, that you withdraw yourselves from every brother who walks in rebellion, and not after the tradition which they received from us.
and not after the tradition which he received of us: The word "tradition" (parpdosis) means "a giving over which is done by word of mouth or in writing, i.e. tradition by inspiration, narrative, precept, etc....hence i.q. Instruction...what is delivered, the substance of the teaching" (Thayer 481-2-3862). The word "received" (paralambano) means "to receive something transmitted...to receive with the mind" (Thayer 484-2-3880).