וְסָפֻ֣ן בָּאֶ֗רֶז מִמַּ֙עַל֙ עַל־הַצְּלָעֹת֙ אֲשֶׁ֣ר עַל־הָֽעַמּוּדִ֔ים אַרְבָּעִ֖ים וַחֲמִשָּׁ֑ה חֲמִשָּׁ֥ה עָשָׂ֖ר הַטּֽוּר׃
And it was covered with cedar above upon the side-chambers, that lay on forty and five pillars, fifteen in a row.
Read Kabbalistic (mystical) interpretations of I Kings 7:3: Zohar and classical Jewish mystical sources, free online.