John Gill

They shall not be ashamed in the evil time,.... Of affliction and persecution, or of old age, or in the day of judgment, when it will go ill with others; see Jo1 2:28; and in the days of famine they shall be satisfied: whether it is understood figuratively of a famine of hearing the word, or literally of a proper famine of bread and water: these God will provide for them, as he did for Elijah, and they shall be sure unto them, and therefore let them not fret nor envy.