King James Version (KJV)
And when Abner was returned to Hebron, Joab took him aside in the gate to speak with him quietly, and smote him there under the fifth {rib}, that he died, for the blood of Asahel his brother. {quietly: or, peaceably}
Modern English
When Abner was returned to Hebron, Joab took him aside into the middle of the gate to speak with him quietly, and struck him there in the body, so that he died, for the blood of Asahel his brother.
Hebrew
וַיָּ֤שָׁב אַבְנֵר֙ חֶבְר֔וֹן וַיַּטֵּ֤הוּ יוֹאָב֙ אֶל־תּ֣וֹךְ הַשַּׁ֔עַר לְדַבֵּ֥ר אִתּ֖וֹ בַּשֶּׁ֑לִי וַיַּכֵּ֤הוּ שָׁם֙ הַחֹ֔מֶשׁ וַיָּ֕מָת בְּדַ֖ם עֲשָׂה־אֵ֥ל אָחִֽיו׃
vayashab ʾabner ḥebrvon vayaṭehv yvoʾab ʾel-tvok hashaʿar ldaber ʾitvo basheliy vayakehv sham haḥomesh vayamat bdam ʿashah-ʾel ʾaḥiyv