Reference for Zevachim 62:1

הא לאכול ולאכול דומיא דלאכול ולהקטיר והיכי דמי בשני בני אדם מצטרף ש"מ

Hence if he intended to eat [half as much as an olive] and to eat [half as much as an olive] in a way similar to [the intention of] eating and burning, - and how is that possible? [that the two half olives] should be eaten by two men, - they would combine.

Jastrow