Davar Halamed

Davar Halamed may-in-yano v’davar halomed mesofo, v’chayn shnay ksuvim hamachishim zeh et zeh.  Ad sheyavoh hakasuv hashlishi v’yachria bay-nay-hem.

A dubious word or passage is explained from it’s context or from a subsequent expression.  Similarly if 2 biblical passages contradict each other they can be harmonized only by a third passage.