Riyad as-SalihinChapter 12Hadith 697
Full Sharh — Riyad as-Salihin 697
وعن معاوية رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم : "من يرد الله به خيرًا يفقه في الدين" ((متفق عليه))
English Translation
Mu'awiyah (May Allah be pleased with him) reported:: The Messenger of Allah said, "When Allah wishes good for someone, He bestows upon him the understanding of Deen.".
Source
Riyad as-Salihin(رياض الصالحين)
The Book of Knowledge
Hadith Number
697