'......And then we used to recite among the Verses in Allah's Book: 'O people! Do not claim to be the offspring of other than your fathers, as it is disbelief (unthankfulness) on your part that you claim to be the offspring of other than your real father......' (Sahih Al-Bukhari, Book 86, Hadith 57)
Above is a portion of the Hadith where Umar RA was on the pulpit mentioning things like the abrogated verse of stoning. Right after that he mentioned this verse which they used to recite. It is nowhere to be found in the Qur'an but it kind of delivers the same message of verses 4 & 5 of Surah Al-Ahzab. Could this just be another verse substituted with similar or better verses or a verse abrogated from its recitation (but not the ruling) like the verse of stoning?