Sayyiduna Ibn Abbas (may Allah be pleased with them both) was in the house of Sayyidah Maymunah (may Allah be pleased with her), and he placed water for ablution for the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) asked: "Who placed this?" Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: I did. He (peace and blessings be upon him) struck him on the shoulder and said: "O Allah, grant him understanding of the religion and teach him interpretation (ta'wil)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10568