וּבְאַחַ֖ת יִבְעֲר֣וּ וְיִכְסָ֑לוּ מוּסַ֥ר הֲבָלִ֖ים עֵ֥ץ הֽוּא׃
Sa iisang bagay sila ay pawang mangmang at hangal: ang aral ng mga walang kabuluhan ay isang kahoy.
Rashi
But with one thing they are brutish i.e., the heathens, and what is that one thing? Their vanities of wood for which they will be punished, and they will be punished for it. יבערו is an expression of foolishness, so is ויכסלו.