πᾶσιν ἡμῖν κατθανεῖν ὀφείλεται → death is a debt which every one of us must pay
P. ἀξιόπιστος, P. and V. ἐχέγγυος (Thuc. but rare P.), φερέγγυος (Thuc. but rare P.), Ar. and P. ἀξιόχρεως (also Euripides, but rare V.).