I made a partial rental payment and my landlord accepted it. Is it fair for him to threaten me a day later for the remaining amt

I paid my landlord $700 of the $800 owed for my rent on time. I told him I would get the remaining $100 to him as quick as possible. The next day he cussed me out and told me he didn't care if I begged, borrowed or stole, that he wanted his money (remaining $100). Im doing everything to pay it but his actions bother me that he will evict over this. Was he out of line in his harassment in this matter?