'Leave me, as I leave you'

Very often in conversations the following retort is heard: ‘The Prophet (peace be upon him) did not do that; the Companions did not do that.’  It is often marshalled in lines of argumentation concerning many topics, tacitly being used as a form of condemnation. Although not explicitly said, the implication behind the retort is that there is a tacit prohibition or censure concerning something, because the Prophet (peace be upon him)