What does Leviticus 18:30 say in the KJV?

Therefore shall ye keep mine ordinance, that ye commit not any one of these abominable customs, which were committed before you, and that ye defile not yourselves therein: I am the LORD your God.

A concluding instruction given to the Israelites regarding prohibited practices.

King James Version (public domain)

Traditionally attributed to Moses · c. 13th century BC · The Pentateuch — Genesis, Exodus, Leviticus, Numbers, and Deuteronomy — is traditionally attributed to him

Context

28That the land spue not you out also, when ye defile it, as it spued out the nations that were before you.

29For whosoever shall commit any of these abominations, even the souls that commit them shall be cut off from among their people.

30Therefore shall ye keep mine ordinance, that ye commit not any one of these abominable customs, which were committed before you, and that ye defile not yourselves therein: I am the LORD your God.