It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both): The Messenger of Allah (peace and blessings be upon him) was in the house of Sayyidah Maymunah (may Allah be pleased with her). I placed water for his (peace and blessings be upon him) ablution. Sayyidah Maymunah (may Allah be pleased with her) told him (peace and blessings be upon him) that Abdullah bin Abbas had placed the water for him, so he (peace and blessings be upon him) supplicated: 'Allahumma faqqihhu fi al-din wa 'allimhu al-ta'wil' (O Allah, grant him understanding of the religion and teach him the interpretation (of the Qur'an)). This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.