Your problem is an all too common one. Under Chapter 40 of the Nevada Revised Statutes, as well as the Federal Helping Families Save Their Homes Act of 2009, purchasers in a foreclosure sale must provide tenants with a 90 day pre-eviction notice. These laws do not excuse you from paying rent for a property in foreclosure but do provide protections to you to make sure that you are not wrongfully evicted while you are considering to whom to pay your rents. The fastest that you could be evicted is 5 judicial days after being served with a 5-Day Pay or Quit Notice, during which time you could either pay the rents or file your Opposition with the Justice Court explaining your circumstances and asking the Court for a hearing.
Likewise Chapter 107 of the Nevada Revised Statutes requires that the foreclosing lender to give you written notice of your right to either: (1) terminate the lease or rental agreement and move out or (2) remain and possibly be subject to eviction proceedings. That notice must also describe their rights and responsibilities under Nevada eviction procedures. The notice must be both posted on the property and mailed to the tenants.