וּמִן־בְּנֵ֧י בִנְיָמִ֛ן אֲחֵ֥י שָׁא֖וּל שְׁלֹ֣שֶׁת אֲלָפִ֑ים וְעַד־הֵ֙נָּה֙ מַרְבִּיתָ֔ם שֹׁמְרִ֕ים מִשְׁמֶ֖רֶת בֵּ֥ית שָׁאֽוּל׃ (ס)
And of the children of Benjamin, the brethren of Saul, three thousand; for hitherto the greatest part of them had kept their allegiance to the house of Saul.
Read kabbalistic (mystical) interpretation of I Chronicles 12:30: and classical mystical sources.