Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
απόφθεγμά my maxims LXX.Deut.32.2
αποφθέγματα maxims LXX.Ezek.13.19

Liddell-Scott-Jones

ἀπόφθεγμα (apophthegma) a maxim G:N-N

ἀπόφθεγμα-φθεγμα, ατος, τό,

terse pointed saying, apophthegm, of Theramenes, [Refs 5th c.BC+]; of Anaxagoras, [Refs 4th c.BC+]; of Pittacus, [Refs]; of the Spartans,[Refs]: in plural, title of work by [Refs 1st c.AD+]