Following are a number of back-translations of Matthew 21:42:

• Uma: “Yesus said saying to them: ‘Certainly you have read the words in the Holy Book which foretell your denial of Me, its sound like this: ‘The stone that was thrown away by the builders of the house, That stone became the main foundation stone. That happened according to the will of the Lord God, no kidding its goodness in our (incl.) sight.’ ‘” (Source: Uma Back Translation)
• Yakan: “Isa said to them, ‘Have you not read in the holy-book, it says, ‘The stone which was rejected by the experts in building stone houses, because they thought/mistakenly that it was of no use, now that one has become the stone that has the greatest use of all. God has done this and it is exceedingly good.'” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “And Jesus said, ‘Surely you have read the written saying of God which says, ‘The stone housebuilding material, the carpenters rejected it because they thought it had no value’ And this has become now the only stone which can properly finish the house. The Lord has done this, and it greatly amazes us (incl.)’ ‘” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “Then Jesus said to them, ‘Your answer is correct. Why then don’t you understand what God caused-to-be-written, saying, ‘The stone that was rejected by the one-building a house, that’s what God turned-into the most-valuable stone that makes-the house -firm. This is what the Lord God did, and it is very-good and amazing in our viewpoint.'” (Source: Kankanaey Back Translation)
• Tagbanwa: “Jesus next asked them, ‘Haven’t you yet read this which was said in the written word of God which says, ‘The rock which was not acceptable to the house builders, that’s what was used as the main-support of the house. God really did this and it is really amazing.'” (Source: Tagbanwa Back Translation)
• Tenango Otomi: “Jesus again spoke to the people: ‘You well know the word written in the Holy Book which says: ‘Concerning the stone not looked well upon by builders, it is that stone which was used to start out the wall. This is what God determined to happen. As for us, we think that it is beautiful what God has done,’ the word says.” (Source: Tenango Otomi Back Translation)

For the Old Testament quote, see Psalm 118:22 and Psalm 118:23.