وَجَعَلْنَا فِيهَا رَوَاسِيَ شَامِخَاتٍAnd have placed therein fixed towers,meaning, the mountains. The earth is held in place with them so that it does not shake and sway.وَأَسْقَيْنَاكُم مَّاء فُرَاتًاand have given you Furat water.meaning, cold and delicious water from the clouds or from what He causes to gush forth from the springs of the earth.وَيْلٌ يوْمَيِذٍ لِّلْمُكَذِّبِينَ