Abbott-Smith Manual Greek Lexicon
καίπερ, (G2539)
5 καίπερ, concessive particle, [in LXX: Pr 6:8 , Wi 11:9 , Jh 1:13 , II-IV Mac 11 *;] although : c. ptcp., Phl 3:4 , He 5:8 7:5 12:17 , II Pe 1:12 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain