Yusuf bin Mahak (may Allah have mercy on him) narrates from Sayyiduna Mu'awiyah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "When Allah intends good for someone, He grants him understanding of the religion."
The father of Ali bin Abdullah (may Allah have mercy on him) told him; he said: I heard Mu'awiyah (may Allah be pleased with him) say: "I heard the Messenger of Allah (peace and blessings be upon him) forbid the wearing of gold and silk."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16859