ἐν ταῖς ἀνάγκαις χρημάτων κρείττων φίλος → it is better in times of need to have friends rather than money, a friend in need is a friend indeed (Menander, Sententiae monostichoi 143)
subs.
P. εἰσφορά, ἡ, ἔρανος, ὁ; or use simply money.