וַיֹּ֤אמֶר יוֹאָב֙ לַכּוּשִׁ֔י לֵ֛ךְ הַגֵּ֥ד לַמֶּ֖לֶךְ אֲשֶׁ֣ר רָאִ֑יתָה וַיִּשְׁתַּ֧חוּ כוּשִׁ֛י לְיוֹאָ֖ב וַיָּרֹֽץ׃
Then said Joab to the Cushite: ‘Go tell the king what thou hast seen.’ And the Cushite bowed down unto Joab, and ran.
Read halakhic rulings (Jewish law) on II Samuel 18:21: and classical halakhic sources.