Kidushin1: 2
עֶבֶד עִבְרִי נִקְנֶה בְּכֶסֶף וּבִשְׁטָר, וְקוֹנֶה אֶת עַצְמוֹ בְשָׁנִים, וּבְיוֹבֵל, וּבְגִרְעוֹן כֶּסֶף.  יְתֵרָה עָלָיו אָמָה הָעִבְרִיָּה שֶׁקּוֹנָה אֶת עַצְמָהּ בְּסִימָנִין.  הַנִּרְצָע נִקְנֶה בִּרְצִיעָה, וְקוֹנֶה אֶת עַצְמוֹ בְיוֹבֵל וּבְמִיתַת הָאָדוֹן.
A Jewish bondman is acquired with money or with a document, and acquires himself with years, or with Yovel, or with the deduction of money.  A Jewish bondwoman has the advantage over him that she acquires herself with signs.  One who[se ear] is bored is acquired by the act of boring, and acquires himself with Yovel or with the death of the master.