וְנָתַ֧ן אֶֽת־הַקְּטֹ֛רֶת עַל־הָאֵ֖שׁ לִפְנֵ֣י יְהוָ֑ה וְכִסָּ֣ה ׀ עֲנַ֣ן הַקְּטֹ֗רֶת אֶת־הַכַּפֹּ֛רֶת אֲשֶׁ֥ר עַל־הָעֵד֖וּת וְלֹ֥א יָמֽוּת׃
E colocará o incenso sobre o fogo diante de יהוה, e a nuvem do incenso cobrirá a tampa que está sobre o Testemunho, para que ele não morra.
Mishnah Sukkah
If he trained a vine or a gourd or ivy over [the sukkah] and put skhakh on top of it, it is not valid. But if the skhakh is more than them, or if he cut them, it is valid. This is the general rule: whatever is susceptible to [ritual] impurity and does not grow from the ground may not be used for skhakh, but whatever is not susceptible to [ritual] impurity and does grow from ground soil may be used for skhakh.