And if he shall come in the second watch, or come in the third watch, and find them so, blessed are those servants.

People's New Testament

12:38 In the second watch. The Jews divided the night into four watches. The second and third covered the midnight hours.

Wesley's Notes

12:38 The Jews frequently divided the night into three watches, to which our Lord seems here to allude.

Jamieson-Fausset-Brown Bible Commentary

38. second . third watch-To find them ready to receive Him at any hour of day or night, when one might least of all expect Him, is peculiarly blessed. A servant may be truly faithful, even though taken so far unawares that he has not everything in such order and readiness for his master's return as he thinks is due to him, and both could and would have had if he had had notice of the time of his coming, and so may not be willing to open to him "immediately," but fly to preparation, and let his master knock again ere he admit him, and even then not with full joy. A too common case this with Christians. But if the servant have himself and all under his charge in such a state that at any hour when his master knocks, he can open to him "immediately," and hail his "return"-that is the most enviable, "blessed" servant of all.

Matthew Henry's Concise Commentary

12:22-40 Christ largely insisted upon this caution not to give way to disquieting, perplexing cares, Mt 6:25-34. The arguments here used are for our encouragement to cast our care upon God, which is the right way to get ease. As in our stature, so in our state, it is our wisdom to take it as it is. An eager, anxious pursuit of the things of this world, even necessary things, ill becomes the disciples of Christ. Fears must not prevail; when we frighten ourselves with thoughts of evil to come, and put ourselves upon needless cares how to avoid it. If we value the beauty of holiness, we shall not crave the luxuries of life. Let us then examine whether we belong to this little flock. Christ is our Master, and we are his servants; not only working servants, but waiting servants. We must be as men that wait for their lord, that sit up while he stays out late, to be ready to receive him. In this Christ alluded to his own ascension to heaven, his coming to call his people to him by death, and his return to judge the world. We are uncertain as to the time of his coming to us, we should therefore be always ready. If men thus take care of their houses, let us be thus wise for our souls. Be ye therefore ready also; as ready as the good man of the house would be, if he knew at what hour the thief would come.