"in your hand": to exclude (money) which is not in your possession.
"and you shall go to the place which the L-rd your G-d chooses": Shiloh or the Temple.
(Ibid. 26) "And you shall give the money": Three "monies" are mentioned herein: ([25] "then you shall change it to money," "vetzarta the money," [26] "and you shall give the money"), the first, for clean tithe; the second, for unclean tithe; the third, for what was bought with second-tithe money, which became unclean. R. Yehudah says: I might think that what was bought for second-tithe money, which became unclean, should be redeemed, and that this followed a fortiori, viz.: If second-tithe (itself) which became unclean is redeemed, then what was bought for second-tithe money, which became unclean — how much more so should it be redeemed! It is, therefore, written "the money" — the first money, and not the second money.