Humran reported,

I brought water for ablution to Uthman bin Affan, and he performed his ablution. Then he said, "People are reporting hadiths from the Messenger of Allah ﷺ which I do not recognize. All I know is that I saw the Messenger of Allah ﷺ perform ablution just as I have performed mine, and then he said, 'Whoever performs ablution in this manner, his past sins will be forgiven, and his prayer and his walk to the mosque will count as voluntary acts of worship.'"In Ibn Abdah's version, the wording is, "I came to Uthman, and he performed ablution."

Muslim 544

Sahih

حدثنا قتيبة بن سعيد وأحمد بن عبدة الضبي قالا حدثنا عبد العزيز وهو الدراوردي عن زيد بن أسلم

عن حمران مولى عثمان قال

أتيت عثمان بن عفان بوضوء فتوضأ ثم قال إن ناسا يتحدثون عن رسول الله ﷺ أحاديث لا أدري ما هي إلا أني رأيت رسول الله ﷺ توضأ مثل وضوئي هذا ثم قال من توضأ هكذا غفر له ما تقدم من ذنبه وكانت صلاته ومشيه إلى المسجد نافلة وفي رواية ابن عبدة أتيت عثمان فتوضأ

مسلم 544صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Purification
Chapter
Virtue of wudu and prayer following it
Numbering
Darussalam 544
Muslim 544