BT Nid 45b(41) :סבר רב המנונ׳ משנה יתירה קא דייק ואדדייק מסיפא לידוק מרישא‏ : PN makes his inference from a redundant Mishna. But before he infers from the latter clause let him infer from the former one
See the entire entry for dwq vb. to observe carefully