TT #233 · Parshas Shemini · Aliyah 7 · Passuk 40
Chabad.org — Vayikra Chapter 11 with Rashi
English: “And the one who eats”: the verse establishes a measure for one who touches and one who carries, corresponding to the measure of eating.
Niddah 42b.
E-Daf.com — Niddah 42b (Tsurras Hadaf)
Measure and analogy — The Chazal applies the verse’s wording to establish the stated rule.
The food measure applies to touching and carrying.