וַיֹּאמְר֣וּ אֵלָ֗יו הֲיָדֹ֤עַ תֵּדַע֙ כִּ֞י בַּעֲלִ֣יס ׀ מֶ֣לֶךְ בְּנֵֽי־עַמּ֗וֹן שָׁלַח֙ אֶת־יִשְׁמָעֵ֣אל בֶּן־נְתַנְיָ֔ה לְהַכֹּתְךָ֖ נָ֑פֶשׁ וְלֹא־הֶאֱמִ֣ין לָהֶ֔ם גְּדַלְיָ֖הוּ בֶּן־אֲחִיקָֽם׃
Y dijéronle: ¿No sabes de cierto como Baalis, rey de los hijos de Ammón, ha enviado á Ismael hijo de Nethanías, para matarte? Mas Gedalías hijo de Ahicam no los creyó.
Or HaChaim
לא תעמוד על דם רעך, "Do not stand idly by when your colleague's blood is being spilled." This part of the verse is a natural corollary of the prohibition to bear tales. When one becomes aware of an assassination attempt for instance, one has to warn the potential victim in order to enable him to save himself. The Torah writes the words: "Do not stand by idly, etc," to warn us that relaying a warning to a person of an attempt to assassinate him which one has overheard does not fall under the prohibition not to bear tales. Failure to warn the potential victim which results in the murder being carried out makes the party who did not issue the warning guilty of violating this commandment. Jeremiah 40,14 reports that Gedalyah ben Achikom was warned of an assassination attempt against him by a fellow Jew Ishmael ben Netanyah. Gedalyah's refusal to believe that he was in danger resulted in his death at the hand of assassins.