What is the meaning of "b'Es Tes"?
Rashi: At the time set to give her to David
How was she given to Adri'el?
Sanhedrin 19b: Sha'ul gave her to him.
Malbim: Adri'el was Mekadesh her without his father's knowledge; she was an adult [and could accept Kidushin by herself]. Chachamim disagreed about whether David's Kidushin of her was valid. Some say that it was not, for he was Mekadesh her with a loan (Sha'ul has promised money to the one who will kill Galyus). A loan does not make Kidushin. 1
Sanhedrin 19b: Even though David also gave 100 foreskins of Plishtim, some say that they have no value. And even if they are worth a Perutah, to feed them to dogs and cats, Kidushin via a loan and a Perutah is invalid because she (or her father, if she is a minor) intends for Kidushin through the loan, and this is invalid.
