Proverbs 18:21

21 Death and life are in the power
Heb “in the hand of.”
of the tongue,
What people say can lead to life or death. The Midrash on Psalms shows one way the tongue [what is said] can cause death: “The evil tongue slays three, the slanderer, the slandered, and the listener” (Midrash Tehillim 52:2). See J. G. Williams, “The Power of Form: A Study of Biblical Proverbs,” Semeia 17 (1980): 35-38.

and those who love its use
The referent of “it” must be the tongue, i.e., what the tongue says (= “its use”). So those who enjoy talking, indulging in it, must “eat” its fruit, whether good or bad. The expression “eating the fruit” is an implied comparison; it means accept the consequences of loving to talk (cf. TEV).
will eat its fruit.
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