Halakhah for Arakhin 56:38

The commandment of the law of one who dedicates from his properties, that it is of the priests: To rule in matters of dedications (cherem, something that is put off limits) - that is, if anyone dedicated something of his possessions undifferentiatedly - for example, [if] he said, "Thing x of mine will become dedicated" - that thing must be given to the priest; as it is stated (Leviticus 27:28), "But any dedication that a man dedicates, etc." [That is,] unless he explicitly said that the dedication be to the Lord, or to the upkeep of the [Temple]. As so did the they, may their memory be blessed, say (Arakhin 28b), "Undifferentiated dedications are for the priest." And their proof is from that which is written explicitly in the section, "like the dedicated field, his holding shall be of the priest."