ف ر تf-r-t
— فُرَاتfurāt: very sweet and pleasant water, which quenches thirst. The lexicographers say that the original sense is intensity of sweetness. Three times in the Quran, each time describing sweet water and mostly in contrast to salt water: ﴿هٰذَا عَذْبٌ فُرَاتٌ وَّهٰذَا مِلْحٌ أُجَاجٌ﴾ (Al-Furqān 25:53) and ﴿وَأَسْقَيْنَاكُمْ مَّاءً فُرَاتًا﴾ (Al-Mursalāt 77:27).