Thauban reported God’s messenger as saying, “Keep to the straight path, which you will not be able to do, know that your best action is prayer and that only a believer observes ablution carefully."
Malik, Ahmad, Ibn Majah and Darimi transmitted it.
Abu Huraira reported God's messenger as saying, "My people will be summoned on the day of resurrection with white faces and hands and feet from the marks of ablution. If any of you can extend his brightness, let him do so."