In these verses the land and beasts and men are addressed respectively. Thus the promise is fully developed. In Joel 2:21 the prophet summons the earth; in Joel 2:22 the beasts of the field; and in Joel 2:23 the sons of Zion; all are called to joy and gladness on account of the great deliverance from destruction which the Lord had wrought for them.
They are all called on to rejoice in the great deliverance; the land, personified, is summoned to exult and rejoice for the great things God now promises to do or is doing to it. If the locusts had done great things in destruction, God will do great things in deliverance.
The beasts are also personified, and forbidden to be afraid; for whereas they had groaned and cried for want of herbage when the pastures were burnt up, those pastures are now beginning to spring, and the fruit trees yield their strength.
The children of Zion are invited to rejoice, not only in the delivered land, or springing pastures, or fruitful figs, or blooming vines, or other trees however useful or ornamental; but, as became them with their superior intelligence, in the Lord their God, as the Father of mercies and the Giver of every good and perfect gift, whether temporal or spiritual.
At the same time, their temporal wants would be attended to, and their land fertilized by the suitable and sustaining shower. The prophet individualizes the earth, the beasts of the field, and the sons of Zion.