Musnad Ahmad 1034:216

Musa ibn Dawud narrated to us, Muhammad ibn Jabir narrated to us, from ‘Amr ibn Murrah, from Abu al-Bakhtari, from Hudhayfah, who said: We were with the Prophet, peace and blessings of Allah be upon him, at a funeral. When we reached the grave, he sat on its edge, then he began to cast his gaze into it, and then he said: "The believer is squeezed in it with a squeeze from which his joints are displaced, and it is filled with fire for the disbeliever." Then he said: "Shall I not inform you of the worst of the servants of Allah? The harsh, the arrogant. Shall I not inform you of the best of the servants of Allah? The weak, the oppressed, the one with two worn-out garments; if he were to swear by Allah, Allah would surely fulfill his oath."