It was historically supplied by the Ayn al-Qusayr (Ain el-Ekseir) spring to the village's north.

[3] In 1596 Al-Qusayr appeared under the name of Qasir in the Ottoman tax registers being in the nahiya of Jawlan Garbi in the Hauran Sanjak.

The villagers paid a fixed tax-rate of 25% on agricultural products, such as wheat (2,700 akçe), barley (450 a.

[4] In 1884 Gottlieb Schumacher noted al-Qusayr (which he spelled 'Ekseir') was a village of 100 inhabitants living in thirty-five stone and clay huts (some of which were deserted).

Although it was had fertile lands, the population was in decline, a situation Schumacher attributed to the village's poor water quality.