I brought water for ablution to Uthman bin Affan while he was sitting on the bench. He performed ablution, doing it well, then said, "I saw the Prophet ﷺ perform ablution while he was sitting in this very spot, and he performed it well. He then said, 'Whoever performs ablution like this, then comes to the mosque and prays two rakahs, then sits down, his previous sins will be forgiven.'"He added, "And the Prophet ﷺ said, 'Do not be deceived.'"
أتيت عثمان بن عفان بطهور، وهو جالس على المقاعد، فتوضأ، فأحسن الوضوء، ثم قال: رأيت النبي ﷺ توضأ، وهو في هذا المجلس، فأحسن الوضوء، ثم قال: من توضأ مثل هذا الوضوء ثم أتى المسجد، فركع ركعتين، ثم جلس، غفر له ما تقدم من ذنبه قال: وقال النبي ﷺ: لا تغتروا.
Bukhari narrated it in the Book of Softening of Hearts (6433) from Saad bin Hafs, who said, Shayban narrated to us, from Yahya, from Muhammad bin Ibrahim Qurashi, who said, Muaz bin Abdul-Rahman informed me that Ibn Aban informed him, and he related it.