This is the 59th most frequent Czech word.
jim
The Czech word "jim" means "to them" (dative case of "oni/ony").
Here, 'jim' is the dative form of the pronoun used for 'them', indicating to whom the book was given.
Dal jsem jim knihu.
I gave them the book.
'Jim' is placed after the verb 'naslouchám' here, again showing the dative case for 'them', specifying the listening object.
Vždy naslouchám jim.
I always listen to them.
Here 'jim' is used with the verb 'věřím', demonstrating the dative case to express who is being trusted.