John Calvin on Genesis 31:50-52

50. If thou shalt take other wives besides my daughters. Laban declares that it would be a species of perfidy, if Jacob should take to himself any other wives. But he had himself compelled Jacob to the act of polygamy: for whence was it that the holy man had more wives than one, except that Leah had been craftily substituted in the place of Rachel? But he now, from a pure sentiment of nature, condemns the fault, of which, blinded by avarice, he had wickedly been the author. And certainly, when the bond of marriage is broken, than which none among men is more sacred, the whole of human society sinks into decay. Wherefore, those fanatical men, who, at this day, delight to defend polygamy, have no need of any other judge than Laban.