(Therein is a running spring) [Al-Ghashiyah: 12], meaning: the collective of springs, which are the rivers.
﴿فِيهَا عين جَارِيَة﴾ يَعْنِي: جَمَاعَةَ الْعُيُونِ، وَهِيَ الْأَنْهَارُ
