Midrash for Chullin 268:48

להביא חלב שעל גבי הקבה וחלב שבתוך הקבה

- To include the fat that lies upon the stomach and the fat within the stomach.<span class="x" onmousemove="('comment',' The fat upon the greater and lesser curvatures of the stomach; v. Tur. Yoreh De'ah c. LXI. Perhaps the second should be read , i.e., the milk within the stomach; and from Rashi (in MSS.) this would appear to be the meaning.');">³⁰</span>

Sifrei Devarim