Halakha Ayub 4:6: Kitzur Shulchan Arukh & Sefer HaChinukh

What is meant by hurting someone with words? A person should not say to someone: "For how much will you sell this article?" when he has no intention of buying it. To someone who wishes to buy grain, he should not say: "Go to so and so," knowing full well that this person has [no grain] to sell. If his neighbor is a ba'al teshuvah, he should not say to him: "Remember what you used to do in the past." If his friend has to endure great suffering, God forbid, he should not speak to him like Iyov's friends spoke to Iyov, [who said]:³Job 4: 6–7. "Is not your fear of God your confidence?… Remember, I pray you, who ever perished being innocent?" (They spoke to him this way because he rebelled against Divine Providence and God's Attributes [of Justice]). If someone is asked a scholarly question, he should not say to a person who is not knowledgeable in this field: "How would you answer this question?" The same applies to all similar situations which would cause heartache [to others].

To not mistreat any Israelite with words: To not mistreat any Israelite with words, meaning to say that one not say to an Israelite words that hurt him or cause him pain and he doesn’t have the strength to be helped by them. And in explanation, they, may their memory be blessed, said (Bava Metzia 58b), “How is it? If he was a penitent, he should not say to him, ‘Remember your previous deeds.’ If ailments are coming upon him, he should not say to him in the way that Job’s friends spoke (Job 4:6), ‘Is not your reverence, your confidence, etc.’ If one saw donkey drivers seeking [feed], he should not say, ‘Go to x,’ when he knows that he does not have any. And do not say to a trader, ‘How much is this item?,’ when he does not wish to buy it.” And about this it is stated (Leviticus 25:17), “A man should not mistreat his countryman.”