Reference for Bava Batra 191:1
דתניא הבודק את החבית להיות מפריש עליה תרומה והולך ואחר כך נמצאת חומץ כל ג' יום ודאי מכאן ואילך ספק
where it has been taught: If one tested<span class="x" onmousemove="('comment',' Either by tasting some of its contents, the heave-offering and tithe having been duly taken from it (Rashb.), or by smelling (Tosaf.) ');"><sup>1</sup></span> a [wine] jug for the purpose of taking from it, periodically, heave-offering [for wine kept in other jugs];<span class="x" onmousemove="('comment',' In order that he might be allowed to use the wine in the other jugs he keeps this one jug for the purpose of taking from it daily, or whenever required, the appropriate quantity of wine as heave-offering. etc., for the wine in the other jugs. ');"><sup>2</sup></span>