I Chronicles 11:42 Kabbalah

עֲדִינָ֨א בֶן־שִׁיזָ֜א הָרֽאוּבֵנִ֗י רֹ֛אשׁ לָרֽאוּבֵנִ֖י וְעָלָ֥יו שְׁלוֹשִֽׁים׃ (ס)

Adina the son of Shiza the Reubenite, a chief of the Reubenites, and thirty with him;

Read kabbalistic (mystical) interpretation of I Chronicles 11:42: and classical mystical sources.