Acts 10:12 Meaning

10And he became very hungry, and would have eaten: but while they made ready, he fell into a trance,

11And saw heaven opened, and a certain vessel descending unto him, as it had been a great sheet knit at the four corners, and let down to the earth:

12Wherein were all manner of fourfooted beasts of the earth, and wild beasts, and creeping things, and fowls of the air.

13And there came a voice to him, Rise, Peter; kill, and eat.

14But Peter said, Not so, Lord; for I have never eaten any thing that is common or unclean.