Muhammad's wives
When Zayd ibn Arqam was older, he retold the hadith of the two weighty things, during the rule of the Umayyad Caliphate. One version is quoted in Sahih Muslim where he, after being asked several times, tells about the event and unwillingly concludes that Muhammad's wives are not part of the Ahl ul-Bayt. In another version, he gives a more vague answer.