Joel 3:10

Beat your ploughshares into swords, and your pruning hooks
into spears
Let not only soldiers, and such as have been trained up in military discipline, appear in the field on this occasion; but let husbandmen and vinedressers leave their fields and vineyards, and turn their instruments of husbandry and vinedressing into weapons of war; let them not plead want of armour, but convert these to such uses: on the contrary, when this battle will be over, swords shall be beaten into ploughshares, and spears into pruning hooks, ( Isaiah 2:4 ) ; let the weak say, I [am] strong;
such as are weak, through sickness, or old age, let them not plead their weakness to excuse them from engaging in this war; but let them make the best of themselves, and say they are strong and healthy, and fit for it, and enter in it with all courage and bravery: this is said either ironically to the enemies of God's people, suggesting that all hands would be wanted, and should be employed, weak and strong, and all little enough; when they had made the utmost effort they could, it would be in vain: or else they are seriously spoken to the people of God, that none of them should excuse themselves, or be discouraged because of their weakness from engaging in this last and more battle; but take heart, and be of good courage, and quit themselves like men, and be strong, since they might be sure of victory beforehand. The Apostle Paul refers to this text in ( 2 Corinthians 12:10 ) ; and applies it to spiritual weakness and strength; and indeed the weakest believer, that is so in faith and] knowledge, may say he is strong, in comparison of what he once was, and others are; strong, not in himself, but in Christ, and the power of his might, and in the grace that is in him; nor should he excuse himself from fighting the Lord's battles, against sin, Satan, and the world, and false teachers; or from doing the Lord's work, any service he calls him to; or from bearing the cross he lays on him on account of his weakness; nor should he: be discouraged by it from those things; but let him strengthen himself, as Aben Ezra interprets it, take heart, and be of good courage.