Following are a number of back-translations of John 12:38:

• Uma: “So, the words of the prophet Yesaya long ago were fulfilled, which said: ‘Lord, there is no-one who believed the news that we (excl.)brought. Although you (sing.) showed them your (sing.) power, they still did not believe.'” (Source: Uma Back Translation)
• Yakan: “It is really true what Nabi Isaya wrote in the holy-book. He said there hep, ‘O God, nobody believes in what we (excl.) say. The people who see your power, few of them understand (it).'” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “For by means of them, the prophecy of Isaiah the prophet of God was fulfilled. For Isaiah said, ‘Lord, no one believes what we preach. No one knows that you have already showed them your power.'” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “in order that what Isaias prophesied would be-fulfilled which says, ‘Lord, why have only a few believed what we (excl.) were saying? Why are there few who accepted/understood your (sing.) power that you (sing.) have been showing?'” (Source: Kankanaey Back Translation)
• Tagbanwa: “It was like that so that what was said by the prophet Isaias would be fulfilled, which said, ‘God, it’s like no-one has acknowledged as true this which was related to/among us (excl.). It’s like no one has understood the real meaning of these things being done through the strength of your supernatural-power.'” (Source: Tagbanwa Back Translation)
• Tenango Otomi: “Such was to come about just like what the prophet Isaiah wrote, ‘Lord. What person came to believe the word I spoke? What person came to know that God showed his power?'” (Source: Tenango Otomi Back Translation)

For the Old Testament quote, see Isaiah 53:1.