LSJ
action against a freedman for having forsaken his προστάτης and chosen another, ἀ. ὀφλεῖν D. 25.65, cf. 35.48, Arist. Ath. 58.3, prob. in IG 2.776.
ἀποστασίου βιβλίον writing or bill of divorce, LXX De. 24.1, Ev. Matt. 19.7, Ev. Marc. 10.4; so ἀποστάσιον Ev. Matt. 5.32.
ἀποστασίου συγγραφή deed of cession, conveyance, PHib. 1.96.3 (iii BC), cf. PGiss. 36.21 (ii BC), etc. ; ἀντίγραφονίου BGU 919.23 (ii AD); with συγγραφή omitted, esp. in phrase πρᾶσις καὶ ἀποστασίου PTeb. 561v (i AD), etc.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)