The Prophet ﷺ wiped his head with the water that remained on his hand.
حدثنا مسدد حدثنا عبد الله بن داود عن سفيان بن سعيد عن ابن عقيل
أن النبي ﷺ مسح برأسه من فضل ماء كان في يده
[Its chain of transmission is daif] Bayhaqi: 1/237 reported it through the hadith of Abu Dawud with the same chain. Sufyan is Thawri, who practices tadlis as will come (748), and Ibn Aqeel, previously mentioned: 126.