Usage: 4 forms in 7 verses
Form Translated As     In Verse(s)
πενόμενοσ ones needing LXX.Exod.30.15
πενομένων being in need LXX.2Kgs.24.14
πενηθείσ to be in need LXX.Prov.30.9
πένηται he should be in need LXX.Lev.14.21
should be in need LXX.Lev.25.25LXX.Lev.25.35LXX.Deut.24.12

Liddell-Scott-Jones

πένομαι (penomai) be in need G:V

πένομαι,

used only in present and imperfect, (compare πενέω):

__I intransitive, toil, work, ἀμφίπολοι.., ἐνὶ μεγάροισι πένοντο [Refs 8th c.BC+]; περὶ δεῖπνον ἐνὶ μεγάροισι π. were busy preparing a meal,[Refs 8th c.BC+]
__I.2 after [Refs 8th c.BC+], (to have to work for one's living, hence) to be poor or needy, [Refs 6th c.BC+]; πλουτοῦντες π. [Refs]
__I.3 with genitive, to be poor in, have need of, τῶν σοφῶν (i. e. τῆς σοφίας) Refs 5th c.BC+ 22b.
__II transitive, work at, get ready, δόμον κάτα δαῖτα πένοντο [Refs 8th c.BC+]; ὁππότε κεν δὴ ταῦτα πενώμεθα when we are a-doing this, [Refs 8th c.BC+]; τί σε χρὴ ταῦτα πένεσθαι[πένομαι, πενία,compare 5th-6th c.BC: Aristophanes Comicus “Plutus” 551 ff. (Cf. πένης, πόνος, πονηρός.) ">Refs 8th c.BC+]