It is narrated from a Companion (may Allah be pleased with him) from Banu Thaqif, who was called al-Hakam or Abu al-Hakam, that he "saw the Prophet (peace and blessings be upon him) perform ablution; then he took a handful of water and sprinkled it over his clothes."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3164