ישעיהו סה:כב פירוש: רש״י ואבן עזרא

like the days of the tree Jonathan renders: the tree of life.

As the days of the tree that lives for a long time, as the Carob³²Comp. Targ. Jonath.: כיומי אילן חייא, as the days of the tree of life; this refers, perhaps, likewise, to the carob tree, which is called the tree of life, on account of its longevity, its evergreen leaves, or its abundance of nutritious food. and similar trees.

And mine elect shall outlive the work of their hands. Many works of man retain still their new appearance, while man has already become old, as e.g. a building, a book. The pronoun their refers to mine elect, the subject of the sentence.