Hawzah News Agency – The merciful prophet of Islam, peace be upon him and his household says:

أوّلُ عَدلِ الآخِرَةِ القُبورُ، لا يُعرَفُ شَريفٌ مِن وَضيعٍ.

'The first [experience of the] justice of the Hereafter is the grave, it does not differentiate between the base-born and the noble.'

Source: al-Jafariyyat, p. 205