And Laban said,.... Being well pleased with the proposal Jacob made, as knowing that, generally speaking, cattle of a colour produced those that were of the same; and whereas Jacob proposed to have a flock of sheep of only white in colour, committed to his care, and to have such for his own that should be produced of them, that were speckled, spotted, and brown, Laban concluded from the general nature of things that he could have but very few, if any, and therefore was for striking the bargain at once:
behold, I would it might be according to thy word; he agreed it should be as Jacob had settled it, and he hoped and wished he would abide by it; he was afraid he would not keep to it.

Laban cheerfully accepted the proposal, but did not leave Jacob to make the selection. He undertook that himself, probably to make more sure, and then gave those which were set apart as Jacob's wages to his own sons to tend, since it was Jacob's duty to take care of Laban's flock, and "set three days' journey betwixt himself and Jacob," i.e., between the flock to be tended by himself through his sons, and that to be tended by Jacob, for the purpose of preventing any copulation between the animals of the two flocks. Nevertheless he was overreached by Jacob, who adopted a double method of increasing the wages agreed upon. In the first place (Genesis 30:37-39), he took fresh rods of storax, maple, and walnut-trees, all of which have a dazzling white wood under their dark outside, and peeled white stripes upon them, הלּבן מחשׂף (the verbal noun instead of the inf. abs. חשׂף), "peeling the white naked in the rods." These partially peeled, and therefore mottled rods, he placed in the drinking-troughs (רהטים lit., gutters, from רהט = רוּץ to run, is explained by המּים שׁקתות water-troughs), to which the flock came to drink, in front of the animals, in order that, if copulation took place at the drinking time, it might occur near the mottled sticks, and the young be speckled and spotted in consequence. ויּחמנה a rare, antiquated form for ותּחמנה from חמם, and ויּחמוּ for ויּחמוּ imperf. Kal of יחם = חמם. This artifice was founded upon a fact frequently noticed, particularly in the case of sheep, that whatever fixes their attention in copulation is marked upon the young (see the proofs in Bochart, Hieroz. 1, 618, and Friedreich zur Bibel 1, 37ff.). - Secondly (Genesis 30:40), Jacob separated the speckled animals thus obtained from those of a normal colour, and caused the latter to feed so that the others would be constantly in sight, in order that he might in this way obtain a constant accession of mottled sheep. As soon as these had multiplied sufficiently, he formed separate flocks (viz., of the speckled additions), "and put them not unto Laban's cattle;" i.e., he kept them apart in order that a still larger number of speckled ones might be procured, through Laban's one-coloured flock having this mottled group constantly in view.

Laban was willing to consent to this bargain, because he thought if those few he had that were now speckled and spotted were separated from the rest, which was to be done immediately, the body of the flock which Jacob was to tend, being of one colour, either all black or all white, would produce few or none of mixt colours, and so he should have Jacob's service for nothing, or next to nothing. According to this bargain, those few that were party - coloured were separated, and put into the hands of Laban's sons, and sent three days journey off: so great was Laban's jealouly lest any of those should mix with the rest of the flock to the advantage of Jacob.