Rashi: Your Gevurah was revealed.

Radak: The Navi compared His great hand that acted in Egypt, and His salvation of Yisrael, to one who rides on a horse. So it compares it to one who holds a bow. Eryah is revealing, just like Your Zero'a was revealed on them. Eryah is like "Erom v'Eryah" (Yechezkel 16:7). Also Se'or is revealing, but it is from a different root. In Eryah, the last letter of the root is silent. Se'or is Nif'al conjugation; the middle letter of the root is silent. We find also "Peshotah v'Orah" (Yeshayah 32:11 ? revealed), "Habit Al Me'oreihem" (2:15).

Malbim: After mentioning that flowing water submits [to His will], it mentions the rainbow ? a sign of the Bris that Yesod ha'Mayim will not flood the land. It arouses to be seen exposed. The rainbow is revealed when Hashem recalls His Shevu'ah.

Rashi: Oaths that You swore to the Shevatim.

Radak: You did all this to fulfill the oaths that You swore to the Avos to give the land to the Shevatim.

Malbim: The verse depicts that the rainbow is revealed, not to recall the Shevu'ah about the flood, rather, a different Shevu'ah ? to redeem the Shevatim at the end of days. It is like the Shevu'ah to Noach ? "Ki Mei Noach Zos Li Asher Nishbati me'Avor Mei Noach Od Al ha'Aretz Ken Nishbati mi'Ktzof Alayich" (Yeshayah 54:9).

Rashi: Selah means forever. Omer has a Segol under the Mem, and the penultimate syllable is accented; it is a noun.

Radak: [To fulfill] what You said. Omer is a noun; its grammatical form is like Chodesh and Kodesh.

Malbim: Selah teaches that this is a Ma'amar Musgar (parenthetical comment).

Rashi: It is like Targum Yonasan (He tears strong rocks, and rivers exude that flood the land).

Radak: You cleaved dry land for them, to give to them much water, like rivers ? "va'Yotzi Nozelim mi'Sala va'Yored ka'Neharos Mayim" (Tehilim 78:15). Targum Yonasan is like this.

Malbim: The land cleaves rivers into channels, and gives place for the Ge'ulim to pass.