ἤϊσαν

From LSJ

πολλοὶ γάρ εἰσιν κλητοὶ ὀλίγοι δὲ ἐκλεκτοί → many are called, but few are chosen

Source

French (Bailly abrégé)

3ᵉ pl. impf. épq. et ion. de εἶμι.

Russian (Dvoretsky)

ἤϊσαν: эп.-ион. (= ᾖεσαν) 3 л. pl. impf. к εἶμι.