It is narrated from Sayyiduna Muawiyah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Do not perform bowing (ruku) or prostration (sajdah) before me, because when I bow before you, you will find me in ruku before I raise my head, and when I prostrate before you, you will find me in sajdah before I raise my head. I am saying this because now my body has become heavy."