Following are a number of back-translations of John 8:28:

• Aguaruna: “Because of this, Jesus said, ‘Fastening me high on a tree, you will know in reference to me, ‘This is the one born becoming a person.’ When you do that you will know, ‘He does not speak just on his own; he tells his Father’s teachings.'”
• Xicotepec De Juárez Totonac: “And for that reason he said to them, ‘Until you raise me up on high, me, the man from above, until then you will not know who I am. You will know then that I do nothing of myself. I do only what the Father has shown me.” (Source for this and above: M. Larson / B. Moore in Notes on Translation February 1970, p. 1-125.)
• Uma: “That is why he said to them again: ‘When you make-me-high later, I the Child of Mankind, only then will you know that it is I. There is not anything that I do according to my own will. I only say what my Father teaches me.” (Source: Uma Back Translation)
• Yakan: “Therefore Isa said to them, ‘When you have already lifted up the Son of Mankind on the post, then you will know that I am the one I am saying. And you will also know that I am not doing anything of myself/my body only and all my teaching is only what my Father commanded me.” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “Therefore Jesus said again, ‘I, the Older Brother of Mankind, when you have nailed me in the future to the wood that will be stood up, you will then know that I am the one chosen by God to rule. You will know then that all that I do, my Father God has caused me to do, and that which he has caused me to say is what I have said.” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “Therefore Jesus also said to them, ‘After (lit. When it is finished) you have caused-me who am Child of a Person -to-be-raised on the cross, then you will thoroughly come-to-know that I am whom I said. You will also come-to-know that there is nothing that I do from my own thoughts, but rather I say only what my Father taught me.” (Source: Kankanaey Back Translation)
• Tagbanwa: “Therefore Jesus said next to them, ‘When you are able to set up the cross on which is nailed he who is the One From Heaven Born of Man, therein you will comprehend that what I am telling is really true as to who I am. You will know that there is nothing which I am doing which is just of myself, but on the contrary, what I am saying is what is being shown/taught to me by my Father.” (Source: Tagbanwa Back Translation)
• Tenango Otomi: “Therefore he said to them, ‘When the Man who came from heaven is nailed to the cross, then you will know who I am. There isn’t one word that I say. The word the Father teaches me is what I speak.” (Source: Tenango Otomi Back Translation)