הַיָּ֣ם רָ֭אָה וַיָּנֹ֑ס הַ֝יַּרְדֵּ֗ן יִסֹּ֥ב לְאָחֽוֹר׃
The sea saw it, and fled; The Jordan turned backward.
Rashi on Psalms
the Jordan turned backward because all the water of Creation split.
הַיָּ֣ם רָ֭אָה וַיָּנֹ֑ס הַ֝יַּרְדֵּ֗ן יִסֹּ֥ב לְאָחֽוֹר׃
The sea saw it, and fled; The Jordan turned backward.