Charles Ellicott Commentary Leviticus 18:27

"(for all these abominations have the men of the land done, that were before you, and the land is defiled);" — Leviticus 18:27 (ASV)

For all these abominations. —Though the contents of this verse are substantially the same as those in Leviticus 18:24-25, yet the wording is different. In the former, the Israelites are exhorted not to pollute themselves as the different tribes or nations have both polluted themselves and the land, while here the inhabitants of Canaan are more specifically described as having practised the abominations. The repetition of the same sentiments in different words, as is frequently the case in Hebrew, is designed to impart emphasis. The parentheses are unnecessary.