Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: The Prophet Muhammad (peace and blessings be upon him) went to relieve himself. I placed water for his ablution. When he returned, he asked: Who placed this? The people replied: Ibn Abbas (may Allah be pleased with them both) did. The Prophet Muhammad (peace and blessings be upon him) supplicated: O Allah! Grant him understanding of (the religion of) Islam.
Hadith Referenceصحیح ابن حبان / كتاب إخباره ﷺ عن مناقب الصحابة رجالهم ونسائهم بذكر أسمائهم رضوان الله عليهم أجمعين / 7053
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «المشكاة» (6148).فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط الشيخين