وَنَبِّئْهُمْ أَنَّ الْمَاءَ قِسْمَةٌ بَيْنَهُمْ ۖ كُلُّ شِرْبٍ مُحْتَضَرٌ

Surah Al-Qamar : 28
And inform them that the water is shared between them, each [day of] drink attended [by turn].

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