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Meaning: perpetuity of existence
The doctrine of immortality is taught in the Old Testament. It is plainly implied in the writings of Moses (Gen. 5:22, 24; 25:8; 37:35; 47:9; 49:29, compare Heb. 11:13-16; Ex. 3:6, compare Matt. 22:23). It is more clearly and fully taught in the later books (Isa. 14:9; Ps. 17:15; 49:15; 73:24).
It was, thus, a doctrine obviously well known to the Jews.