Accepting a partial rent payment and giving a 5 day pay or quit

[Mark Akins]

I live in Arizona and have accepted a partial payment from my tenant. I accepted the partial payment on the 8th of April (which was already late)and he agreed to pay the rest on the 17th of April. I agreed to this. It is now the 18th of April and I still have not received the second half. All this communication was done through text messaging. No paper agreements were signed. Am I able to give the tenant a 5 day pay or quit notice today or do I take the loss and wait till next month to start the eviction process if he does not pay on time again?