Bulugh al-Maram, Book 1, Hadith 49 (In-Book)

Narrated ‘Abdullah bin Zaid (rad): He saw the Prophet taking some water to wipe his ears other than the water he had taken to wipe his head. [Reported by Al-Baihaqi, who said that its Isnad (chain of narrators) is authentic and At-Tirmidhi also graded it Sahih].

وَعَنْهُ, { أَنَّهُ رَأَى اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-يَأْخُذُ لِأُذُنَيْهِ مَاءً خِلَافَ اَلْمَاءِ اَلَّذِي أَخَذَ لِرَأْسِهِ.‏ } أَخْرَجَهُ اَلْبَيْهَقِيّ ُ (54)‏.‏ ‏5 ‏- البيهقي (1 /65)‏ وقال: "هذا إسناد صحيح".‏

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also referenced under: Book 1, Hadith 48 (English)