Following are a number of back-translations of 1 Corinthians 10:21:

• Uma: “When we drink wine in our worshipping the Lord Yesus, we cannot also drink wine with those who worship demons. We can’t eat bread to remember the Lord’s death, and also eat with those who are worshipping demons. So it certainly isn’t fitting for us to enter an idol worship house and eat with them who worship idols. [NOTE: This is Paul’s main point, but he never explicitly states it! Cf. section heading at 10:14]” (Source: Uma Back Translation)
• Yakan: “When you gather to eat and drink to remember the death of Isa Almasi, you cannot also follow/join in eating and drinking what the people have given to their idols. Because if you eat that, it is as if you follow now the demons.” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “As for us (incl.) believers, if we carry out that which was commanded about the Lord’s supper, it is not allowable that we eat and drink also, that which was sacrificed by unbelievers to the demons. Because it’s as if we have fellowship with demons.” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “It is not possible for you to join in eating and drinking what has been offered to demons and at-the-same-time join in eating and drinking what reminds us of the Lord’s death.” (Source: Kankanaey Back Translation)
• Tagbanwa: “For it is really not allowable that you include yourselves in the drinking and eating which is a remembrance of the far-from-ordinary death of the Lord, and (that you) also take part in feasts which are their means of worshipping the messengers of Satanas.” (Source: Tagbanwa Back Translation)
• Tenango Otomi: “You can not eat the Holy Supper the Lord Jesus left for us to do and also go to where is eaten the meat offered to evil spirits.” (Source: Tenango Otomi Back Translation)