BT Ḥul 10b(15) :רב כהנא מצריך בדיקותא בין כל חדא וחדא‏ : PN used to require an examination it [i.e. the knife] between each one (of the slaughterings)
See the entire entry for bḏīqū, bḏīqūṯā n.f. examination