Aramaic words in Devarim? Or am I tripping?

I was reading Re’eh and I noticed there were words that seemed out of place because they had what seemed to me to be the plural Aramaic ending “-un” (-in??) for both nouns and verbs on some words. Or at least I thought that was Aramaic grammar. I don’t remember it being a form used in Torah.

Examples from perek 12:

תִּשְׂרְפ֣וּן

תִּשְׁמְר֣וּן

לֹא־תַֽעֲשׂ֣וּן כֵּ֔ן

I thought the entirety of the Torah was written in Lashon Kodesh? Am I wrong? Is there something I’m missing? I don’t remember ever seeing this grammatical ending used in the Torah itself. Only in Talmud, Targum, etc…