לֹֽא־תַעֲשׂ֨וּ לָכֶ֜ם אֱלִילִ֗ם וּפֶ֤סֶל וּמַצֵּבָה֙ לֹֽא־תָקִ֣ימוּ לָכֶ֔ם וְאֶ֣בֶן מַשְׂכִּ֗ית לֹ֤א תִתְּנוּ֙ בְּאַרְצְכֶ֔ם לְהִֽשְׁתַּחֲוֺ֖ת עָלֶ֑יהָ כִּ֛י אֲנִ֥י יְהוָ֖ה אֱלֹהֵיכֶֽם׃
Ye shall make you no idols, neither shall ye rear you up a graven image, or a pillar, neither shall ye place any figured stone in your land, to bow down unto it; for I am the LORD your God.
Shaarei Teshuvah
“And a figured stone you shall not set in your land” (Leviticus 26:1). We were warned with this not to bow down on a floor of stones in the synagogue or in any other place, except for the Temple.