Sunan Ibn Majah 1567

It was narrated from ‘Uqbah bin ‘Amir that the Messenger of Allah (ﷺ) said:‘If I were to walk on a live coal or a sword, or if I were to sew shows to my feet, that would be better for me than walking on the grave of a Muslim. And I see no difference between relieving myself in the midst of graves or in the middle of the marketplace.”