17 When [Jesus] went into the house away from the crowd, the disciples asked Him about the parable.
18 And He said to them, “Are you also as lacking in understanding? Don’t you realize that nothing going into a man from the outside can defile him?
19 For it doesn’t go into his heart but into the stomach and is eliminated.” (As a result, He made all foods clean.)
Scholars say that Mark was a disciple of the Apostle Peter and that Mark simply put down in writing what Peter preached and taught. In this passage, the Gospel of Mark tells us that Jesus made all foods clean.
In Acts 10, that very same Apostle Peter receives a revelation from heaven:
13 Then a voice said to him, “Get up, Peter; kill and eat!”
14 “No, Lord!” Peter said. “For I have never eaten anything common and ritually unclean!”
15 Again, a second time, a voice said to him, “What God has made clean, you must not call common…