With one of his hands wrought in the work, and with the other hand held a weapon - That is, he had his arms at hand, and was as fully prepared to fight as to work. So Ovid, Epist. xi., Canace Macario, ver. 1: -

Si qua tamen caecis errabunt scripta lituris,

Oblitus a dominae caede libellus erit:

Dextra tenet calamum; strictum tenet altera ferrum:

Et jacet in gremio charta soluta meo.

If streaming blood my fatal letter stain,

Imagine, ere you read, the writer slain.

One hand the sword, and one the pen employs,

And in my lap the ready paper lies.

Dryden.

By this mode of speech Canace does not intimate to her brother Macarius, that she actually held the sword in one hand while she held the pen in the other, but that she had it ready to slay herself as soon as she had written the epistle.

That laid the mortar and stones upon it, and timber where it was necessary:

and they that bore burdens; that carried the mortar, stones, and timber to the builders, and served them:

with those that laded; which prepared the above for them, and laid them on their shoulders:

everyone with one of his hands wrought in the work, and with the other hand held a weapon; which is not to be understood strictly and literally, for without both hands they could not well perform either of the above works; but proverbially, signifying that they were intent on both working and fighting, and were ready and prepared to do the latter, as well as the former, having weapons lying by them, or girt about them, as is explained in the following verse.

They which builded on the wall, and they that bare burdens, with those that laded, every one with one of his hands wrought in the work, and with the other hand held a weapon.

4:17 A Weapon - This is to be taken figuratively; being a proverbial speech, as when they say of a man pretending kindness, he carries bread in one hand, and a stone in another. Thus must we work out our salvation, with the weapons of our warfare in our hands. For in every duty we must expect opposition from our spiritual enemies.

4:16-23 We must watch always against spiritual enemies, and not expect that our warfare will be over till our work is ended. The word of God is the sword of the Spirit, which we ought to have always at hand, and never to have to seek for it, either in our labours, or in our conflicts, as Christians. Every true Christian is both a labourer and a soldier, working with one hand, and fighting with the other. Good work is likely to go on with success, when those who labour in it, make a business of it. And Satan fears to assault the watchful Christian; or, if attacked, the Lord fights for him. Thus must we wait to the close of life, never putting off our armour till our work and warfare are ended; then we shall be welcomed to the rest and joy of our Lord.