If he sanctify his field from the year of jubilee,.... The very year, as Aben Ezra, while it is current, or when it is past, and he immediately sanctifies it for an holy use, and one comes to redeem it, as Jarchi says, as soon as ever it is devoted, and a priest has valued it, and there is a purchaser of it:

according to thy estimation it shall stand; what price soever the priest set upon it, that it was to go at, and he that had a mind to purchase it might have it for it, unless it was he that devoted it, and then he was to give a fifth part more, as afterwards expressed.

If he sanctified his field from the year of jubilee, i.e., immediately after the expiration of that year, it was to "stand according to thy valuation," i.e., no alteration was to be made in the valuation. But if it took place after the year of jubilee, i.e., some time or some years after, the priest was to estimate the value according to the number of years to the next year of jubilee, and "it shall be abated from thy valuation," sc., praeteritum tempus, the time that has elapsed since the year of jubilee. Hence, for example, if the field was vowed ten years after the year of jubilee, the man who wished to redeem it had only forty shekels to pay for the forty years remaining up to the next year of jubilee, or, with the addition of the fifth, 48 shekels. The valuation was necessary in both cases, for the hereditary field was inalienable, and reverted to the original owner or his heirs in the year of jubilee without compensation (cf. Leviticus 27:21 and Leviticus 25:13, Leviticus 25:23.); so that, strictly speaking, it was not the field itself, but the produce of its harvests up to the next year of jubilee, that was vowed, whether the person making the vow left it to the sanctuary in natura till the year of jubilee, or wished to redeem it again by paying the valuation price. In the latter case, however, he had to put a fifth over and above the valuation price (Leviticus 27:19, like Leviticus 27:13 and Leviticus 27:15), that it might be left to him.

If he sanctify his field from the year of jubilee, according to thy estimation it shall stand.

27:17 From the year of jubilee - That is, immediately after the year of jubilee is past. According to thy estimation - Now mentioned, of fifty shekels for an omer of barley seed. It shall stand - That is, that price shall be paid without diminution.

27:14-25 Our houses, lands, cattle, and all our substance, must be used to the glory of God. It is acceptable to him that a portion be given to support his worship, and to promote his cause. But God would not approve such a degree of zeal as ruined a man's family.