[2] Its original name is unknown,[1] and some scholars identify it with the ancient city of Jazer, mentioned several times in the Hebrew Bible and in 1 Maccabees.

In 2000, Chang-ho C. Ji from La Sierra University in California included Khirbet es-Sar in his survey project.

[1] Since 2018, work in Khirbet es-Sar has been conducted by an expedition from the Polish Centre of Mediterranean Archaeology University of Warsaw, directed by Prof. Jolanta Młynarczyk and Dr. Mariusz Burdajewicz from the Institute of Archaeology University of Warsaw in cooperation with Department of Antiquities of Jordan.

The first-ever excavations on the site were preceded by non-invasive research: the whole area was surveyed using an electrical resistivity method, and all architectural objects visible on the surface were documented.

[5] Khirbat es-Sar lies on the road linking the Jordan Valley with Rabbath Ammon, the Greco-Roman Philadelphia (modern Amman), so it must have been an important strategic and trade center.