וַיָּבֵ֨א אֶת־הַבַּדִּ֜ים בַּטַּבָּעֹ֗ת עַ֚ל צַלְעֹ֣ת הַמִּזְבֵּ֔חַ לָשֵׂ֥את אֹת֖וֹ בָּהֶ֑ם נְב֥וּב לֻחֹ֖ת עָשָׂ֥ה אֹתֽוֹ׃ (ס)
Targum Jonathan on Exodus
And he put the staves into the rings, upon the sides of the altar, to carry it by them: hollow with boards, and filled with earth made he it.