The Prophet said: "Do not sit on the graves nor perform Salat towards them."
Jami` at-Tirmidhi Book 10, Hadith 86
← Previous Hadith "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."

Jami` at-Tirmidhi Book 10, Hadith 85 Next Hadith → from the Prophet, similar (to no. 1050), but it does not contain "From Abu Idris" and this is what is correct.

Jami` at-Tirmidhi Book 10, Hadith 87