Rashi on Exodus 16:21/רש"י על שמות ט״ז:כ״א

1וחם השמש ונמס AND WHEN THE SUN WAXED HOT, IT MELTED — What was left in the field (outside the inhabited camp) melted and ran in streams; the harts and the roes drank therefrom, and the nations of the world hunted them and experienced through them the taste of the Manna, and thereby understood how great was Israel’s excellency (Mekhilta).

2ונמס Onkelos translates by פָּשָׁר, having the same meaning as פושרים, tepid waters: through the sun it became warm and turned into tepid water; old French détemperer. An example of it (פשר) occurs in Treatise Sanhedrin at the end of the chapter that begins, ארבע מיתות‎ (Sanhedrin 67b).