"On the next day, as they were on their way and approaching the city, Peter went up on the housetop about the sixth hour to pray. But he became hungry and was desiring to eat; but while they were making preparations, he fell into a trance; and he saw the sky opened up, and an object like a great sheet coming down, lowered by four corners to the ground,
and there were in it all kinds of four-footed animals and crawling creatures of the earth and birds of the air. A voice came to him,
"Get up, Peter, kill and eat!" But Peter said, "By no means, Lord, for I have never eaten anything unholy and unclean." Again a voice came to him a second time,
"What God has cleansed, no longer consider unholy." This happened three times, and immediately the object was taken up into the sky."
Acts 10:9-16
some cross-references;
Matthew 15:11 "It is not what enters into the mouth that defiles the man, but what proceeds out of the mouth, this defiles the man."
Mark 7:19 because it does not go into his heart, but into his stomach, and is eliminated?" (Thus He declared all foods clean.)
Romans 14:14 I know and am convinced in the Lord Jesus that nothing is unclean in itself; but to him who thinks anything to be unclean, to him it is unclean.
1 Corinthians 10:25 Eat anything that is sold in the meat market without asking questions for conscience' sake;
1 Timothy 4:4 For everything created by God is good, and nothing is to be rejected if it is received with gratitude;
Titus 1:15 To the pure, all things are pure; but to those who are defiled and unbelieving, nothing is pure, but both their mind and their conscience are defiled.
The one who eats is not to regard with contempt the one who does not eat, and the one who does not eat is not to judge the one who eats, for God has accepted him.
Romans 14:3