I have a question, why is pork unclean ?
a search from the internet:
http://www.quran.net/comp-std/pork.htm
In the book of Leviticus, chapter 11, v. 7, it is recorded that God declares the pig to be unclean for believers. Then, in verse 8, God says: “You must not eat their meat or touch their carcasses; they are unclean for you”. This command is repeated in Deuteronomy 14:7-8. Then, in Isaiah 65:2-4, and 66:17, God issues a stern warning against those who eat pork.
Some people are aware of this prohibition from God, but they say that they can eat pork because St. Paul said that all food is clean in his letter to the Romans 14:20. St. Paul said this because he believed (as he wrote in his letter to the Ephesians 2:14-15) that Jesus had abolished the Law with all its commandments and regulations. He seems, however, to have misunderstood what he heard about Jesus. In the Gospel According to Matthew 5:17-20, Jesus is reported to have said quite the contrary, as follows: “Do not think that I have come to abolish the Law . . . ." Jesus then went on in that passage (in verse 19) to denounce anyone who would break the smallest commandment and teach others likewise. He also praised his true followers who will practice and teach even the smallest commandment. One of the commandments, as we have seen, is to stay away from pork.
This is why the true followers of Jesus, holding on to his teachings, did not let unclean food such as pork enter their mouths, so that Peter, the chief disciple, can say, “I have never eaten anything impure or unclean” (Acts of the Apostles, ch. 10, v. 14)
Five chapters later in the Acts of the Apostles, 15:29, we find that the original disciples still differentiate between clean and unclean foods, and this time Paul is in agreement with them. Six chapters later, in ch. 21, v. 25, their decision to impose food regulations on believers is mentioned without regret, and this time Paul is challenged to prove that he is in agreement with them; and he demonstrated his full agreement with them.
What remains, then, is that Jesus, on whom be peace, upheld the prohibition against pork. His disciples also upheld it, and so must all his followers. Those who fail to uphold it need to be informed and reminded of this rule from God. This is one reason why God sent His final messenger, on whom be peace. God says:
“O people of the Scripture ! Now has Our Messenger come unto you, expounding unto you much of that which you used to hide in the Scripture, and forgiving much. Now has come unto you light from Allah and a plain Scripture.” (The Meaning of the Glorious Qur’an 5:15)