The rivers have raised... – these are the two points which are tzeirei ֵ. Who is it that rises above them with two arms? It is ḥolem ˙, and through it they are made into a segolta ֒. And who is it that descends below them with 2 thighs? This is ḥireq ִ, and through it they are made into segol ֶ.
At that time, the rivers have raised their voice... which is: (Gen. 27:22) the voice of Jacob, the voice of the shophar. To where do they raise it? Towards Father and Mother. And when it descends, it descends with the two points which are shva ְ, – the ‘two thighs of truth’, then it is this that is written: (Ps. 93:3)... the rivers shall raise (yise-u) their depth, as in: (Num. 7:9)... upon their shoulders they shall carry (yisa-u).