Reference for Zevachim 182:1
<big><strong>גמ׳</strong></big> אמר שמואל לדברי ר"ט המתנדב שמן קומצו ושיריו נאכלין מאי טעמא אמר קרא קרבן מנחה מלמד שמתנדבין שמן וכי מנחה מה מנחה קומצה ושיריה נאכלין אף שמן קומצו ושיריו נאכלין
<big><b>GEMARA: </b></big>Samuel said: According to R'Tarfon, when a man donates oil [by itself], he removes a fistful, burns it [on the altar], and its residue is eaten. What is the reason? - Scripture saith, [And when any one bringeth] a meal-offering:<span class="x" onmousemove="('comment',' Lev. II, 1. vjbn icre icre vjbn chre,');"><sup>1</sup></span> this teaches that one can donate oil [by itself],<span class="x" onmousemove="('comment',' The Heb. is of which (an offering) is superfluous, since itself denotes the offering, and moreover , bringeth, icre vjbn is of the same root as and implies it. Hence it is understood to include even an offering of oil alone, without flour. ( , generally rendered meal-offering, simply means a gift, of anything, although it is usually applied to offerings of flour.)');"><sup>2</sup></span>