Owing to the continual moving of the Sheep, the shepherd had very hard work during the lambing time, and was obliged to carry in his arms the young lambs which were too feeble to accompany their parents, and to keep close to him those Sheep who were expected soon to become mothers. At that time of year the shepherd might constantly be seen at the head of his flock, carrying one or two lambs in his arms, accompanied by their mothers. In allusion to this fact Isaiah writes: "His reward is with Him, and His work before Him. He shall feed His flock like a shepherd; He shall gather the lambs with His arms and carry them in His bosom, and shall gently lead them that are with young" (or, "that give suck," according to the marginal reading). Here we have presented at once before us the good shepherd who is no hireling, but owns the Sheep; and who therefore has "his reward with him, and his work before him;" who bears the tender lambs in his arms, or lays them in the folds of his mantle, and so carries them in his bosom, and leads by his side their yet feeble mothers. Frequent mention is made of the folds in which the Sheep are penned; and as these folds differed--and still differ--materially from those of our own land, we shall miss the force of several passages of Scripture if we do not understand their form, and the materials of which they were built. Our folds consist merely of hurdles, moveable at pleasure, and so low that a man can easily jump over them, and so fragile that he can easily pull them down. Moreover, the Sheep are frequently enclosed within the fold while they are at pasture. If any one should entertain such an idea of the Oriental fold, he would not see the force of the well-known passage in which our Lord compares the Church to a sheepfold, and Himself to the door. "He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber. But he that entereth in by the door is the shepherd of the sheep. To him the porter openeth, and the sheep hear his voice.... All that ever came before me are thieves and robbers: but the sheep did not hear them. I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture." [Illustration: ANCIENT SHEEP PEN.] Had the fold here mentioned been a simple enclosure of hurdles, such an image could not have been used. It is evident that the fold to which allusion was made, and which was probably in sight at the time when Jesus was disputing with the Pharisees, was a structure of some pretensions; that it had walls which a thief could only enter by climbing over them--not by "breaking through" them, as in the case of a mud-walled private house; and that it had a gate, which was guarded by a watchman.