Bereshis 30:40

40 And Ya’akov did separate the kesavim, and set the faces of the tzon toward the streaked, and all the dark in the tzon Lavan; and he put his own adarim (flocks) by themselves, and put them not unto the tzon Lavan.

Bereshis 30:40 Meaning and Commentary

Genesis 30:40

And Jacob did separate the lambs
The ringstraked, speckled, and spotted; and set the faces of the flocks,
that were all white, towards the ringstraked, and all the brown in the flock of Laban;
either to go before those that were all white, that they by looking at them might conceive and bring forth such, which was another artifice of Jacob's to increase his own sheep; or else he set at the water troughs the white sheep on one side of them, and on the opposite side the speckled ones that the same effect might also be produced the more successfully both by the rods and by the speckled lambs: and he put his own flocks by themselves, and put them not unto Laban's
cattle;
partly that they might not be mixed together, but kept distinct, that what was his property might be discerned from Laban's; and partly, lest his spotted ones, being mixed with Laban's white sheep, by continual looking at them, should conceive and bring forth such likewise, and so his flocks be lessened.

Bereshis 30:40 In-Context

38 And he set the maklot which he had peeled before the flocks in the small channels of the shikatot mayim (watering troughs) when the tzon came to drink. And since they bred when they came to drink,

39 And the flocks bred before the maklot, and brought forth tzon streaked, speckled, and spotted.

40 And Ya’akov did separate the kesavim, and set the faces of the tzon toward the streaked, and all the dark in the tzon Lavan; and he put his own adarim (flocks) by themselves, and put them not unto the tzon Lavan.

41 And it came to pass, whensoever tzon hamekusharot (the stronger flock) did breed, that Ya’akov set the maklot before the eyes of the tzon in the trough channels, that they might breed among the maklot.

42 But when the tzon were feeble, he put them not in: so the feebler would belong to Lavan, and the stronger to Ya’akov.