Strong's numbers
ἄπταιστος G679
áptaistos
ap-tah'-ee-stos
from Α (as a negative particle) and a derivative of πταίω; not stumbling, i.e. (figuratively) without sin:--from falling.
Abbott–Smith
** ἄ-πταιστος, -ον (< πταίω), [in LXX: III Mac 6:39*;]
without stumbling, sure-footed: metaph. (MM, s.v.), Ju 24.†
From G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), in the public domain.
1 occurrence
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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Jude 1:24
Now unto him that is able to keep you from falling, and to present you faultless before the presence of his glory with exceeding joy,
1 in the Septuagint
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3 Maccabees 6:39
ἐν αἷς καὶ μεγαλοδόξως ἐπιφάνας τὸ ἔλεος αὐτοῦ ὁ τῶν πάντων δυνάστης ἀπταίστους αὐτοὺς ἐρρύσατο ὁμοθυμαδόν.
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.