Genesis 31:8

If he said thus, The speckled shall be thy wages; then all the cattle bare speckled; and if he said thus, The ring-straked (banded) shall be thy hire; then bare all the cattle ring-straked. When Laban noted that his cattle were bearing in favor of Jacob, according to the original contract, he changed the stipulation from time to time, making it ever more difficult for Jacob to gain, since the provisions were narrowed more with every new agreement.