Rashi: This refers to verse 16 - "Dodi Li va'Ani Lo." This was until the time that the sin caused and the sun's heat scorched me and the heat overpowered.

Seforno: This is when it is hot in every direction due to the sun's rays.

Malbim (Melitzah): This connection [with her Beloved] will be only until the day gets hot ¹ . This is a metaphor for until physicality's nature will overpower, and its conductors will weary of engaging imagination.

Rashi: We sinned with the Egel and with the Meraglim. The Tzelalim (merits that protect us) departed; I cast off His yoke.

Seforno: They flee via investigation and deed.

Malbim (Melitzah): The shadows are visions of imagination. They will depart when physicality and its natures are aroused to return to their bodily matters. Then the supreme Beloved will depart to His Kadosh abode, and the Dibur will cease because bodily powers returned to engage in their physical needs.

Rashi: I caused Him to depart from me, on mountains far from me.

Seforno: Turn to us; Your mercy should come quickly, like a deer.

Malbim (Mashal): Depart from here, lest Bnos Yerushalayim find you when they return. Be like a deer that returns back to its place. So He will return to Nefesh Shlomo whenever he is ready for understanding. The second song finished.

Rashi: It is an expression of division.

Seforno: You are far from my salvation.