אֵ֚ין בָּֽאָר֔וֹן רַ֗ק שְׁנֵי֙ לֻח֣וֹת הָאֲבָנִ֔ים אֲשֶׁ֨ר הִנִּ֥חַ שָׁ֛ם מֹשֶׁ֖ה בְּחֹרֵ֑ב אֲשֶׁ֨ר כָּרַ֤ת יְהוָה֙ עִם־בְּנֵ֣י יִשְׂרָאֵ֔ל בְּצֵאתָ֖ם מֵאֶ֥רֶץ מִצְרָֽיִם׃
There was nothing in the ark save the two tables of stone which Moses put there at Horeb, when the LORD made a covenant with the children of Israel when they came out of the land of Egypt.
Read Kabbalistic (mystical) interpretations of I Kings 8:9: Zohar and classical Jewish mystical sources, free online.