Genesis 31:36

And Jacob was wroth, and chode with Laban - The expostulation of Jacob with Laban, and their consequent agreement, are told in this place with great spirit and dignity. Jacob was conscious that though he had made use of cunning to increase his flocks, yet Laban had been on the whole a great gainer by his services. He had served him at least twenty years, fourteen for Rachel and Leah, and six for the cattle; and some suppose he had served him twenty years besides the above, which is not unlikely: see the remarks at the conclusion of this chapter. (See Clarke at Genesis 31:55 (note)) Forty or even twenty years of a man's life, devoted to incessant labor and constantly exposed to all the inclemencies of the weather, (see Genesis 31:40), deserve more than an ordinary reward. Laban's constitutional sin was covetousness, and it was an easily besetting sin; for it appears to have governed all his conduct, and to have rendered him regardless of the interests of his children, so long as he could secure his own. That he had frequently falsified his agreement with Jacob, though the particulars are not specified, we have already had reason to conjecture from Genesis 31:7, and with this Jacob charges his father-in-law, in the most positive manner, Genesis 31:41. Perhaps some previous unfair transactions of this kind were the cause why Jacob was led to adopt the expedient of outwitting Laban in the case of the spotted, spangled, ring-streaked, and grisled cattle. This if it did take place, though it cannot justify the measure, is some palliation of it; and almost the whole of Jacob's conduct, as far as relates to Laban, can be better excused than his injuring Laban's breed, by leaving him none but the weak, unhealthy, and degenerated cattle.