Can Muslims be enslaved by other Muslims?

Islam permits slavery but I haven't been able to find anything regarding keeping slaves who are Muslims. Considering a hypothetical scenario taking place during the early Islamic days where one Muslim nation goes to war with another Muslim nation and one of them comes out victorious. What would the ruling be in context of Islamic Doctrine regarding taking war booty and slaves from the fallen Muslim nation? Are there any ruling at all in Quran or Hadith? Thank you.