Halakhah sa Levitico 27:23: Sefer HaChinukh

And that which they, may their memory be blessed, said (Arakhin 23a) that we ask about appraisals and values [in order to annul them] in the [same] way that we ask about other vows and consecrations. And they also said (Arakhin 24a) that if there were animals or slaves or jewels among the possessions of the appraiser and the traders say, “If he buys clothing of thirty dinar for this slave, he will increase his value by more than sixty”; or “If you wait on this animal for a month, its value will increased by double”; or “If they bring this jewel to place x, it will be worth much money” — we do not listen to them at all. Rather we sell everything in their place and in their time, as it is stated (Leviticus 27:23), “and he shall give the appraisal on that day, a sacred donation to the Lord.” And the understanding came about this that this verse teaches about all consecrated things that we do not sustain them, we do not wait with them for the market day and we do not take them from one place to [another]. And this is the principle — that they only have their place and time alone. And what are these words speaking about? About movable items. But we proclaim [the intention to sell] lands sixty consecutive days — morning and evening — and afterwards, we sell them.