הֲל֤וֹא תֵֽדְעוּ֙ הֲל֣וֹא תִשְׁמָ֔עוּ הֲל֛וֹא הֻגַּ֥ד מֵרֹ֖אשׁ לָכֶ֑ם הֲלוֹא֙ הֲבִ֣ינֹתֶ֔ם מוֹסְד֖וֹת הָאָֽרֶץ׃
Know ye not? hear ye not? Hath it not been told you from the beginning? Have ye not understood the foundations of the earth?
Rashi on Isaiah
Do you not know...the foundations of the earth Who founded it, and you should have worshipped Him.
Ibn Ezra on Isaiah
הלא תדעו Have ye not known by your own common sense, which is the most important source of knowledge ;
Ibn Ezra on Isaiah
הלא תשמעו have you not heard; have you not been informed by others;