It is narrated from Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) forbade wearing silk clothing, yellow-colored clothing, wearing a gold ring, and reciting the Qur'an during bowing (ruku‘).
Hadith Referenceالسنن المأثورة / باب ما جاء في القراءة في الركوع والسجود / 160
Hadith Takhrijصحیح مسلم، الصلاة، باب النهي عن قرأة القرآن في الركوع والسجود، رقم: 480