If you read this as part of the entire chapter, and also as Christ told us to read in spirit and truth, you will find this was teaching that God came for the gentiles as well as the Jews. It was telling Paul and Peter to take the gospel to the gentiles, for they were cleansed by God and not common.Acts 10
10:10 And he became very hungry, and would have eaten: but while they made ready, he fell into a trance,
10:11 And saw heaven opened, and a certain vessel descending upon him, as it had been a great sheet knit at the four corners, and let down to the earth:
10:12 Wherein were all manner of fourfooted beasts of the earth, and wild beasts, and creeping things, and fowls of the air.
10:13 And there came a voice to him, Rise, Peter; kill, and eat.
10:14 But Peter said, Not so, Lord; for I have never eaten any thing that is common or unclean.
10:15 And the voice spake unto him again the second time, What God hath cleansed, that call not thou common.
All though the bible it shows that we are to look at the physical world we live in as good, as a reflection of the spiritual. The laws given about what food to eat wasn't, spiritually, about food but about being clean in our thinking. All the food that was forbidden was from animals who ate refuse. It relates, spiritually, to the verse in Phil 4:8 about keeping our mind on clean good things, not on the refuse of life. When Christ came, when we receive the HS we can obey this in spirit and truth, and know the food choice isn't the important thing.