Abdullah bin Buraydah (may Allah have mercy on him) relates: Sayyiduna Mu'awiyah (may Allah be pleased with him) sent for Daghfal and asked him about the Arabic language, the genealogies of people and the stars, and he turned out to be a scholar (of these sciences). He said: "O Daghfal, where did you memorise this from?" He said: "I memorised it with a tongue that asks much and a heart that understands well, and the bane of knowledge is forgetfulness." He said: "Then take Yazid and teach him Arabic, the genealogies of Quraysh and the stars."
Hadith Referenceالمعجم الكبير للطبراني / باب الدال / 4186