Al-Matalib al-'Aliyah 2534 — Kindness to parents

Adi bin Adi (may Allah have mercy on him) narrates from his father (Sayyiduna Adi bin Amirah, may Allah be pleased with him) that the Commander of the Faithful, Sayyiduna Umar bin al-Khattab (may Allah be pleased with him), said: "Among those (words of revelation) that used to be recited, we used to read: 'Do not turn away from your true forefathers (that is, by denying your lineage and attributing yourselves to someone else), for (concealing or changing your real lineage) is kufr on your part (that is, grave ingratitude and misguidance).'"
Imam Abu Dawud al-Tayalisi narrated this hadith in his Musnad, and its basic content is also narrated in Sahih Bukhari (6778) and Sahih Muslim (1691).