Ye must die (μελλετε αποθνησκειν). Present indicative of μελλω, to be about to do and present active infinitive of αποθνησκω, to die. "Ye are on the point of dying." Eternal death.

By the spirit (πνευματ). Holy Spirit, instrumental case.

Ye shall live (ζησεσθε). Future active indicative of ζαω. Eternal life.