About to buy a house and tenants have not paid rent to old owners

[Josh Fralish]

I'm closing on a house in a couple weeks and it is currently occupied with renters who have not paid for months. The current owner will not evict them. After I sign on the house what can I do? Do I have to give them time to see if they will start paying me? Can I evict immediately? Not sure what to do, I'm new to this with my first house closed on this May.