Leviticus 27:16

Of his possession — That is, which is his by inheritance, because particular direction is given about purchased lands, Leviticus 27:22. And he saith, part of it, for it was unlawful to vow away all his possessions, because thereby he disabled himself from the performance of divers duties, and made himself burdensome to his brethren. According to the seed — That is, according to the quantity and quality of the land, which is known by the quantity of seed which it can receive and return. Fifty — shekels — Not to be paid yearly, 'till the year of jubilee, but once for all, as is most probable, Because here is no mention of any yearly payment, but only of one payment. Because it is probable that lands were moderately valued, that men might be rather encouraged to make such vows, than deterred by excessive impositions. But if this were yearly rent, it was an excessive rate, and much more than the land ordinarily yielded. For an omer is but the tenth part of an ephah, about a pottle of our measure, which quantity of seed would not extend very far, and in some lands would yield but an inconsiderable crop, especially in barley, which was cheaper than wheat and which for that reason, among others, may be mentioned rather than wheat.