For the source text click/tap here: Chullin 95
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Rav is of the opinion that if meat is ever left without being directly supervised by visual contact, it may not be eaten.
The Gemara tells the story of Rav who was travelling to visit his son-in-law. When he arrived at the river, the ferry boat was just arriving, which Rav understood as a good omen.
He declared, “This is a good omen that today will be a day of good tidings!” When he arrived at his son-in-law’s house, he was greeted by the entire household who came out to see him, including the workers who were preparing the meat. Rav kept the meat in the house in his eyesight during the entire reception, and it was therefore not prohibited to be eaten. Rav nevertheless chose not to eat from it.
We explore the toleration of divination in Talmud.