My landlord did not pay the mortgage and the house has now gone into foreclosure. What to do next.

There is a sticky note at the top of this forum that deals with this issue:

https://www.askmehelpdesk.com/real-estate-law/paying-rent-when-property-foreclosure-316199.html

Until the foreclosure is finalized, he still owns the property and you are required to pay the rent.

If you have any further questions after reading the info in that link please feel free to ask.