@elva.wehner
In Russian, you can say "будь тихонько" (bud' tihon'ko) to tell someone to be quiet. This literally translates to "be quietly." Another way to say this in Russian would be "заткнись" (zatknis') which means "shut up."
It's important to note that these phrases might be considered impolite or rude in some situations, so it's always a good idea to be mindful of the context in which you are using them.