וַיֹּ֧אמֶר ל֣וֹ יוֹאָ֗ב לֹא֩ אִ֨ישׁ בְּשֹׂרָ֤ה אַתָּה֙ הַיּ֣וֹם הַזֶּ֔ה וּבִשַּׂרְתָּ֖ בְּי֣וֹם אַחֵ֑ר וְהַיּ֤וֹם הַזֶּה֙ לֹ֣א תְבַשֵּׂ֔ר כִּֽי־על [עַל־] [כֵּ֥ן] בֶּן־הַמֶּ֖לֶךְ מֵֽת׃
And Joab said unto him: ‘Thou shalt not be the bearer of tidings this day, but thou shalt bear tidings another day; but this day thou shalt bear no tidings, forasmuch as the king’s son is dead.’
Read halakhic rulings (Jewish law) on II Samuel 18:20: and classical halakhic sources.