Jami` at-Tirmidhi Book 10, Hadith 85

"Ali said to Abu Al-Hayyaj Al-Asadi: 'I am dispatching you with what the Prophet dispatched me: "That you not leave an elevated grave without leveling it, nor an image without erasing it."

Previous Hadith

"A red velvet cloth was placed in the grave of the Prophet."

Jami` at-Tirmidhi Book 10, Hadith 84
Next Hadith

The Prophet said: "Do not sit on the graves nor perform Salat towards them."

Jami` at-Tirmidhi Book 10, Hadith 86