Surah Al-Qamar, ayah 28

54:28

وَنَبِّئۡهُمۡ أَنَّ ٱلۡمَآءَ قِسۡمَةُۢ بَيۡنَهُمۡۖ كُلُّ شِرۡبٖ مُّحۡتَضَرٞ ٢٨

Wanabbi'hum annal-mā'a qismatu baynahum kullu shirbim muhtadar

And inform them that the water is shared between them,1584 each [day of] drink attended [by turn].

Footnotes

1584 i.e., between the tribe of Thamūd and the she-camel - a day for each to drink.