Radak: Do not disgrace Him via not listening to His words. (Rather, listen to His words!)

Malbim: Do not transgress what Nebuchadnetzar made him swear in Hashem's name ¹ .

Radak: Before the sun will darken for you, i.e. the day will seem like night due to the many afflictions.

Malbim: Before Hashem darkens through Hashgachah.

Rashi: They will stumble [Radak - like one who walks in the dark. He bangs his foot on a rock, like Yeshayah (30:6) prophesized about them "Masa Bahamos Negev."

Rashi: They are dark mountains on your way to exile.

Radak: It is where you thought to be elevated (and take refuge) - through Egypt's help, or on the mountains.

Radak, Malbim: [Help] from Egypt.

Radak: [Hashem] turned your hope for light into great darkness.

Rashi: It is to turn the light to darkness. Radak - this is a repetition of "v'Samah l'Tzalmaves" in different words. Shis is Makor (like an infinitive); it is written Yashis; both of these are like Yasim (to put).