Sir is a Palestinian town in the Jenin Governorate of Palestine, in the West Bank, located 18 kilometers south of Jenin. According to the Palestinian Central Bureau of Statistics, the town had a population of 769 inhabitants in mid-year 2006 and 857 by 2017.

The Mosaic of Reḥob, is a late 3rd–6th century CE mosaic discovered in 1973. The mosaic, written in late Mishnaic Hebrew, describes the geography and agricultural rules of the local Jews of the era. It was inlaid in the floor of the foyer or narthex of an ancient synagogue near Tel Rehov, 4.5 kilometres (2.8 mi) south of Beit She'an and about 6.5 kilometres (4.0 mi) west of the Jordan River. The mosaic contains the longest written text yet discovered in any Hebrew mosaic in Israel, and also the oldest known Talmudic text.