וְאֵ֛לֶּה מִסְפַּ֥ר הַגִּבֹּרִ֖ים אֲשֶׁ֣ר לְדָוִ֑יד יָשָׁבְעָ֣ם בֶּן־חַכְמוֹנִ֗י רֹ֚אשׁ השלושים [הַשָּׁ֣לִישִׁ֔ים] הֽוּא־עוֹרֵ֧ר אֶת־חֲנִית֛וֹ עַל־שְׁלֹשׁ־מֵא֥וֹת חָלָ֖ל בְּפַ֥עַם אֶחָֽת׃
And this is the number of the mighty men whom David had: Jashobeam, the son of a Hachmonite, the chief of the captains; he lifted up his spear against three hundred and slew them at one time.
Read kabbalistic (mystical) interpretation of I Chronicles 11:11: and classical mystical sources.