Strong's numbers
ἀποστασία G646
apostasía
ap-os-tas-ee'-ah
feminine of the same as ἀποστάσιον; defection from truth (properly, the state) ("apostasy"):--falling away, forsake.
Abbott–Smith
† ἀποστασία, -ας, ἡ (< ἀφίστημι), [in LXX for מַעַל, etc.;]
defection, apostasy, revolt; in late Gk. (MM, Exp., viii; Lft., Notes, 111; Cremer, 308) for cl. ἀπόστασις, freq. in sense of political revolt, in LXX (e.g. Jos 22:22, II Ch 29:19, Je 2:19) and NT always of religious apostasy: Ac 21:21, II Th 2:3.†
From G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), in the public domain.
2 occurrences
Shown in the King James Version (KJV), whichever translation you read in — it is the text these numbers are tagged against.
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Acts 21:21
And they are informed of thee, that thou teachest all the Jews which are among the Gentiles to forsake Moses, saying that they ought not to circumcise their children, neither to walk after the customs.
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2 Thessalonians 2:3
Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;
4 in the Septuagint
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Joshua 22:22
Ὁ θεὸς θεός ἐστιν Κύριος, καὶ ὁ θεὸς θεὸς αὐτὸς οἶδεν, καὶ Ἰσραὴλ αὐτὸς γνώσεται. εἰ ἐν ἀποστασίᾳ ἐπλημμελήσαμεν ἔναντι τοῦ κυρίου, μὴ ῥύσαιτο ἡμᾶς ἐν ταύτῃ·
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2 Chronicles 29:19
καὶ πάντα τὰ σκεύη ἃ ἐμίανεν Ἄχας ὁ βασιλεὺς ἐν τῇ βασιλείᾳ αὐτοῦ ἐν τῇ ἀποστασίᾳ αὐτοῦ ἡτοιμάκαμεν καὶ ἡγνίκαμεν· ἰδού ἐστιν ἐναντίου τοῦ θυσίαστηρίου Κυρίου.
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1 Maccabees 2:15
Καὶ ἦλθον οἱ παρὰ τοῦ βασιλέως οἱ καταναγκάζοντες τὴν ἀποστασίαν εἰς Μωδεεὶν τὴν πόλιν, ἴνα θυσιάσωσιν.
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Jeremiah 2:19
παιδεύσει σε ἡ ἀποστασία σου, καὶ ἡ κακία σου ἐλέγξει σε· καὶ γνῶθι καὶ ἴδε ὅτι πικρόν σοι τὸ καταλιπεῖν σε ἐμέ, λέγει Κύριος ὁ θεός σου· καὶ οὐκ εὐδόκησα ἐπὶ σοί, λέγει Κύριος ὁ θεός σου.
Biblion's Septuagint: the Greek Old Testament in H. B. Swete's edition (Cambridge, 1896–1905), as digitized by the Open Greek and Latin project at the University of Leipzig (First1KGreek), corrected against the printed pages, with lemmas, morphology, Strong's numbers and links to the Hebrew prepared for Biblion. CC BY-SA 4.0.