Tractate Avadim

[The regulations regarding] a Hebrew slave and a slave whose ear is bored [nirẓa‘] are in force only when the Jubilee [is in force]. [The regulations regarding] a field of possession and a field which had been devoted [to the Temple] are in force only when the Jubilee [is in force]. R. Ishmael said: For that reason it is stated, As a field devoted; the possession thereof shall be the priest’s—as possession [depends] on the Jubilee, so a field which had been devoted [depends] on the Jubilee. The Jubilee is on the same footing as the New Year in regard to the blowing [of the shofar], and the benedictions, except that [the blowing of] the shofar on the Jubilee overrides the Sabbath. When did the Jubilees cease [to be observed]? From the time when Pul and Tiglath-pileser, kings of Assyria, came up and carried the Reubenites, the Gaddites and half the tribe of Manasseh into captivity.

A Hebrew slave is acquired by money purchase or by document, and he acquires his freedom by years of service, through the advent of the Jubilee and by deduction of money. The Hebrew handmaid has an advantage over him in that she acquires her freedom by the signs [of puberty]. The nirẓa‘ is acquired by the boring [of his ear] and acquires his freedom through [the advent of] the Jubilee or through the death of his master.