Related for Bava Metzia 11:21

[The process of something being transferred to the] ownership of the Temple with money, how so? If the treasurer gave coins for hekdesh moveable property, he acquires the hekdesh wherever he is; but a layperson [not empowered by the authority of the Temple] doesn't acquire until the moment he draws [it]. Speech [by a Temple treasurer or another official is as effective in transferring property] to the Temple as the handing over of a layperson. How so? "This ox is hekdesh", "This house is hekdesh"—even from where to the end of the world, he acquires the hekdesh wherever he is; but a layperson only acquires when he takes possession [of it].