“When a person presents a [meal] offering” – what is written prior to this matter? “He shall remove its crop with its feathers” (Leviticus 1:16). Rabbi Tanḥuma bar Ḥanilai said: This bird flies and soars in the entire world, eats everywhere, and eats that which is stolen and extorted. The Holy One blessed be He said: ‘Since this crop is filled with stolen and extorted items, let it not come near the altar.’
That is why it is stated: “He shall remove its crop.” But an animal is raised on the trough of its owner, and does not eat everywhere and does not [eat] that which is stolen or that which is extorted. That is why it is stated: “The priest shall present everything and burn it on the altar” (Leviticus 1:13). Because a person robs and extorts, come and see how much suffering and effort [is entailed] until his food is excreted from him.
From the mouth to the esophagus, from the esophagus to the cardia, from the cardia to the fundus, from the fundus to the corpus, from the corpus to the antrum, from the antrum to the lower stomach, from the lower stomach to the small intestine, from the small intestine to the large intestine, from the large intestine to the cecum, from the cecum to the rectum, and from the rectum outside. Come and see how much suffering and effort until his food is excreted from him.