Dictionary entry

ἐνισχύω

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

ἐν-ισχύω

[in LXX for חָזַק, etc.;]

to strengthen: in spiritual sense, Lk 22[43]; pass., Ac 9:19 (Rec. ἐνισχύσεν, became strong, as in LXX, Ge 12:1048:2, al.).†