When the builders had so far reason to think the design of the enemies broken as to return to their work, yet they were not so secure as to lay down their arms, knowing how restless and unwearied they were in their attempts, and that, if one design failed, they would be hatching another. Thus must we watch always against our spiritual enemies, and not expect that our warfare will be accomplished till our work is. See what course Nehemiah took, that the people might hold themselves in a readiness, in case there should be an attack. 1. While one half were at work, the other half were under their arms, holding spears, and shields, and bows, not only for themselves but for the labourers too, who would immediately quit their work, and betake themselves to their weapons, upon the first alarm, Neh 4:16. It is probable that they changed services at stated hours, which would relieve the fatigue of both, and particularly would be an ease to the bearers of burdens, whose strength had decayed (Neh 4:10); while they held the weapons, they were eased and yet not idle. Thus dividing their time between the trowels and the spears, they are said to work with one hand and hold their weapons with the other (Neh 4:17), which cannot be understood literally, for the work would require both hands; but it intimates that they were equally employed in both. Thus must we work out our salvation with the weapons of our warfare in our hand; for in every duty we must expect to meet with opposition from our spiritual enemies, against whom we must still be fighting the good fight of faith. 2. Every builder had a sword by his side (Neh 4:18), which he could carry without hindering his labour. The word of God is the sword of the Spirit, which we ought to have always at hand and never to seek, both in our labours and in our conflicts as Christians. 3. Care was taken both to get and give early notice of the approach of the enemy, in case they should endeavour to surprise them. Nehemiah kept a trumpeter always by him to sound an alarm, upon the first intimation of danger. The work was large, and the builders were dispersed; for in all parts of the wall they were labouring at the same time. Nehemiah continually walked round to oversee the work and encourage the workmen, and so would have speedy intelligence if the enemy made an attack, of which, by sound of trumpet, he would soon give notice to all, and they must immediately repair to him with a full assurance that their God would fight for them, Neh 4:18-20. When they acted as workmen, it was requisite they should be dispersed wherever there was work to do; but when as soldiers it was requisite they should come into close order, and be found in a body. Thus should the labourers in Christ's building be ready to unite against a common foe. 4. The inhabitants of the villages were ordered to lodge within Jerusalem, with their servants, not only that they might be the nearer to their work in the morning, but that they might be ready to help in case of an attack in the night, Neh 4:22. The strength of a city lies more in its hands than in its walls; secure them, and God's blessing upon them, and be secure. 5. Nehemiah himself, and all his men, kept closely to their business. The spears were held up, with the sight of them to terrify the enemy, not only from sun to sun, but from twilight to twilight every day, Neh 4:21. Thus ought we to be always upon our guard against our spiritual enemies, not only (as here) while it is light, but when it is dark, for they are the rulers of the darkness of this world. Nay, so very intent was Nehemiah upon his work, and so fast did he hold his servants to it, that while the heat of the business lasted neither he himself nor his attendants went into bed, but every night lay and slept in their clothes (Neh 4:23), except that they shifted them now and then, either for cleanliness or in a case of ceremonial pollution. It was a sign that their heart was upon their work when they could not find time to dress and undress, but resolved they would be at all times ready for service. Good work is likely to go on successfully when those that labour in it thus make a business of it.