Genesis 2:11

פישון PISHON — This is the Nile, the River of Egypt. Because its waters grow plentiful and rise and water the land, it is called Pishon, the name being of the same root as the verb in (Habakkuk 1:8) ופשו פרשיו “and their horsemen increased”; another interpretation of the name Pishon is: it is so called because it grows flax (פשתן) (Genesis Rabbah 16:2) for it is said with reference to Egypt (Isaiah 19:9) “Moreover they that work in combed flax, shall be ashamed.”

שֵׁ֥ם הָֽאֶחָ֖ד פִּישׁ֑וֹן ה֣וּא הַסֹּבֵ֗ב אֵ֚ת כׇּל־אֶ֣רֶץ הַֽחֲוִילָ֔ה אֲשֶׁר־שָׁ֖ם הַזָּהָֽב׃

The name of the first is Pishon: that it is which compasses the whole land of Ḥavila, where there is gold;