26 That is, “if you are harming and exploiting one another.” Paul’s metaphors are retained in most modern translations, but it is possible to see the meanings of δάκνω and κατεσθίω (daknō and katesthiō, L&N 20.26 and 88.145) as figurative extensions of the literal meanings of these terms and to translate them accordingly. The present tenses here are translated as customary presents (“continually …”).
27 Or “destroyed.”

In other versions

But if you bite and devour one another, watch out that you are not consumed by one another.

If you bite and devour each other, watch out or you will be destroyed by each other.

But if you bite and devour one another, watch out, or you will be consumed by one another.

But if you are always biting and devouring one another, watch out! Beware of destroying one another.

But if you bite and devour one another, watch out that you are not consumed by one another.

But if ye bite and devour one another, take heed that ye be not consumed one of another.

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