Following are a number of back-translations of Romans 10:21:

• Uma: “Yet as for the Israel people, God says like this: ‘All day long I offer my hand wanting to receive them, but they just rebel and their hearts are always hard.'” (Source: Uma Back Translation)
• Yakan: “But if it is about the people of Isra’il, this is what Isaya said, ‘God says, ‘I am always persuading/pleading with people not listening to me, people whose heads are hard (stubborn, rebellious).’ ‘” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “There’s also something God says by means of the words of Isaiah concerning the people who are descendants of Israel, where he said, ‘Their breath is very hard (they are very stubborn) and they were very disobedient, because I am always begging them to believe in me, but they will not listen.'” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “But what he says concerning the Jews is this: ‘For-a-long-time I have repeatedly-called a collective-people who don’t obey me and whose minds are hard.'” (Source: Kankanaey Back Translation)
• Tenango Otomi: “But concerning the Jews God said: ‘Day after day I called to these Jews. But they do not want to hear (= obey) the word I say.'” (Source: Tenango Otomi Back Translation)

For the Old Testament quote, see Isaiah 65:2.