Usage: 4 forms in 10 verses
Form Translated As     In Verse(s)
ενδελεχισμόυ a perpetual LXX.Exod.29.42
perpetual LXX.Ezra.3.5
ενδελεχισμόν perpetual LXX.Dan.11.31
ενδελεχισμού a perpetual LXX.Num.28.23
of perpetuity LXX.Exod.29.38LXX.Exod.30.8
perpetual LXX.Num.28.6LXX.Neh.10.33LXX.Dan.12.11
ενδελεχισμου perpetual LXX.Neh.10.33

Liddell-Scott-Jones

ἐνδελεχισμός (endelechismos) in perpetuity G:N-M

ἐνδελεχισμός-ισμός, ,

={ἐνδελέχεια}, persistence, [Refs 3rd c.AD+]; θυμίαμα -ισμοῦ perpetual incense, [LXX]; especially of daily sacrifices,[Refs] is falsa lectio in [LXX+1st c.AD+]

LSJ Scripture Refs: LXX.Exod.30.8LXX.Dan.11.31