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According to the Acts of the Apostles, chapter 10, Saint Peter had a vision of a vessel full of animals being lowered from heaven. A voice from heaven told Peter to kill and eat, but since the vessel contained unclean animals, Peter declined. The command was repeated two more times, along with the voice saying, "What God hath made clean, that call not thou common" and then the vessel was taken back to heaven.
At this point in the narrative, messengers sent from Cornelius the Centurion arrive and urge Peter to go with them. He does so, and mentions the vision as he speaks to Cornelius, saying "God hath shewed me that I should not call any man common or unclean". Peter related the vision again in Acts 11:4–9.