Isru Chag (Hebrew: אסרו חג‎, lit. 'Bind [the] Festival') refers to the day after each of the Three Pilgrimage Festivals in Judaism: Pesach, Shavuot and Sukkot. The phrase originates from the verse in Psalms 118:27, which states, “Bind the festival offering with cords to the corners of the altar.” This verse, according to the Sages of the Talmud, should homiletically be understood to mean “Whosoever makes an addition to the Festival by eating and drinking is regarded by Scripture as though he had built an altar and offered thereon a sacrifice.”