Mistakenly saying something of kufr
Q: If a person, due to slip of tongue, said something of kufr while not intending it, is he kafir?
For example, a person wanting to say that "one who rejects God is not a Muslim" but he accidentally says "one who rejects God is not a kafir" but then he realises and corrects it. Does he have to renew his iman and nikah?