At noon on the same day as they were on their journey and approaching the city, Peter went up to the roof to pray. While he was praying he became hungry, while the meal was being prepared he fell into a trance. That is when he saw heaven open and a large sheet being let by its four corners with all kinds of animals, reptiles, and birds.
Then a voice told him to get up kill and eat and then Peter said surly not I don't eat anything impure or unclean. The voice spoke a second time and said do not call anything impure that God had made clean. the sheet was taken back to heaven and that had happen three times.