Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) went into the toilet, then came out and saw a covered vessel. He asked: "Who did this?" Abdullah (Ibn Abbas) said: I did. He (peace and blessings be upon him) said: "O Allah, teach him the interpretation of the Qur'an."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11970