Musar על בבא מציעא 116:7

And anyone who causes pain to a fellow Jew transgresses a prohibitive command, as it is said: "And you shall not wrong one another but you shall fear the Lord" (Lev. 25:17), and this phrase "you shall not wrong" is said concerning wronging by words (Baba Mezi'a 58b). And our Rabbis, of blessed memory, said: "All gates are closed to hearing accusations against the repentant except the gate of wronging a fellow Jew" (Ibid. 59a). Therefore, should one be very careful not to cause pain to his companion in any way — not by deeds and not by words.

The second category; he who speaks gossip that is true Even if he should remind another in private of some evil deed of his ancestors, he transgresses what is written in the Torah, "And ye shall not wrong one another" (Lev. 25:17); it is concerning wrongs done with words that the Scripture speaks (Baba Mezi'a 58b).