Abbott-Smith Manual Greek Lexicon
ὁρκωμοσία (G3728)
4 ὁρκωμοσία , -ας, ἡ ( ὅρκος , ὄμνυμι ; by metapl. for τὰ ὁρκωμόσια , asseverations on oath ; v. MM, xviii), [in LXX: Ez 17:18 , 19 ( אָלָה ) I Es 9:93 *;] affirmation on oath , an oath : He 7:20 , 21 , 28 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain