Following are a number of back-translations of Mark 9:29:

• Uma: «He said to them: ‘Evil-spirits like that cannot be expelled with any knowledge whatsoever, only with prayer.'» (Source: Uma Back Translation)
• Yakan: «He said to them, ‘That kind of demon cannot be cast out by anything except only if asked of God.'» (Source: Yakan Back Translation)
• Western Bukidnon Manobo: «And Jesus answered, he said, ‘That kind of demon cannot be driven away except by prayer, for there is no other way.'» (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: «‘An evil-spirit like that, it doesn’t leave if the one causing-it -to-leave doesn’t pray to God,’ said Jesus answering.» (Source: Kankanaey Back Translation)
• Tagbanwa: «Jesus replied, saying, ‘That kind of evil spirit can’t be driven out without perseverance/much-effort in prayer.'» (Source: Tagbanwa Back Translation)