Leviticus only applies to the Levites

[Huggy Bear]

To put it simply.
The book of Leviticus explains to the priesthood (Levites) how they were to preform their duties.

And 1st and 2nd Corinthians was addressed to a specific church in Corinth. It wasn't addressed to "all Christians now and in the future".

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Nitpick: in the OP, that should be "Galatia", not "Galilee".

As I stated earlier "The book of Leviticus explains to the priesthood (Levites) how they were to preform their duties."

The old priesthood has been abolished and instead God chose to place his spirit in everyone.

Acts 2:17
And it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams:

As a result all that have received the spirit are now considered "High priests"

1 Peter 2:5
you also, like living stones, are being built into a spiritual house to be a holy priesthood, offering spiritual sacrifices acceptable to God through Jesus Christ.

So whereas the ancient priesthood (Levites) were responsible for the spiritual well being of the nation of Israel, now each individual is responsible for their own spiritual well being.

Philippians 2
12 Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling.

So to answer your question while Paul's letter to the Corinthians deals with issues the Corinthians were having at the time, it still sets a precedent for all Christians.