וּבְבֵ֤ית מַרְכָּבוֹת֙ וּבַחֲצַ֣ר סוּסִ֔ים וּבְבֵ֥ית בִּרְאִ֖י וּֽבְשַׁעֲרָ֑יִם אֵ֥לֶּה עָרֵיהֶ֖ם עַד־מְלֹ֥ךְ דָּוִֽיד׃
and at Beth-marcaboth, and Hazar-susim, and at Beth-biri, and at Shaaraim. These were their cities unto the reign of David.
Read kabbalistic (mystical) interpretation of I Chronicles 4:31: and classical mystical sources.