It is narrated from Sayyiduna Uthman (may Allah be pleased with him) that once the Prophet (peace and blessings of Allah be upon him) washed each part of his body three times during ablution.
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 403
Hadith Gradingحکم دارالسلام:حديث صحيح لغيره، عامر بن شقيق ضعفه ابن معين وذكره ابن حبان فى الثقات