Genesis 30:34 - Wesley's Explanatory Notes

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.