Seven colors of the rainbow, seven verses of the parsha, seven differing sources, that is to say, perspectives, or ways of looking at the rainbow.
What do we first think of when we think of the rainbow? What's our association? What do we see when we hear the term, when we think of it? What do we think the parsha, or the section is going to tell us? Will each of these opinions agree? disagree? Is there more than one way to see a rainbow? Or to understand a verse?
I will maintain My covenant with you: never again shall all flesh be cut off by the waters of a flood, and never again shall there be a flood to destroy the earth.”
God further said, “This is the sign that I set for the covenant between Me and you, and every living creature with you, for all ages to come.
אֶת־קַשְׁתִּ֕י נָתַ֖תִּי בֶּֽעָנָ֑ן וְהָֽיְתָה֙ לְא֣וֹת בְּרִ֔ית בֵּינִ֖י וּבֵ֥ין הָאָֽרֶץ׃
I have set My bow in the clouds, and it shall serve as a sign of the covenant between Me and the earth.
And God remembered Noah (Gen. 8:1). May it please our master to teach us the benediction recited upon witnessing a rainbow. Thus did our masters teach us: Upon seeing a rainbow, one should recite the benediction: Blessed art Thou, O Lord our God, King of the universe, who doth remember His covenant, is faithful in His covenant, and fulfills His word. This blessing is found in the Mishnah. How do we know that it is also derived from the Torah? Because it is written: I have set My bow in the cloud, and it shall be as a sign of a covenant (Gen. 9:13).
Why do we make the blessing on the rainbow?
If there is a double rainbow, do you have to make two blessings?
What sights in the sky or on earth do you think should have blessings?
TEN things were created (on the eve of the Sabbath) in the twilight (namely): the mouth of the earth; the mouth of the well; the mouth of the ass; the rainbow; the Manna; the Shamir; the shape of the alphabet; the writing and the tables (of the law); and the ram of Abraham. (Some sages say: the destroying spirits also, and the sepulchre of Moses, and the ram of Isaac; and other sages say: the tongs also.)

