וְיָצָ֧אתִי אַחֲרָ֛יו וְהִכִּתִ֖יו וְהִצַּ֣לְתִּי מִפִּ֑יו וַיָּ֣קָם עָלַ֔י וְהֶחֱזַ֙קְתִּי֙ בִּזְקָנ֔וֹ וְהִכִּתִ֖יו וַהֲמִיתִּֽיו׃
I went out after him, and smote him, and delivered it out of his mouth; and when he arose against me, I caught him by his beard, and smote him, and slew him.
Read halakhic rulings (Jewish law) on I Samuel 17:35: and classical halakhic sources.