A History of Judaism - Martin Goodman

(below) Mikveh at Qumran from the first century ce. Many such baths for ensuring ritual
purity have been found on archaeological sites in Roman Palestine.

Stone vessels from Jerusalem in the late Second Temple period. Such receptacles were
popular in Judaea and Galilee in the first century ce, probably in part because stone, unlike
pottery, was regarded as unsusceptible to ritual impurity.