Abbott-Smith Manual Greek Lexicon
ἐκ-καθαίρω (G1571)
2 ἐκ-καθαίρω [in LXX for בָּעַר , etc. ;] to cleanse thoroughly, cleanse out : c. acc, ἑαυτόν , II Ti 2:21 ; of the impurity removed, ζυμήν , I Co 5:7 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain