Musnad Ahmad Hadith 23457

It is narrated from Hudhaifa (may Allah be pleased with him) that once we were with the Prophet Muhammad (ﷺ) at a funeral. When we reached near the grave, the Prophet (ﷺ) sat at its edge and kept looking into it repeatedly. Then he said that a Muslim is squeezed in the grave once, by which all his burdens are removed, and for the disbeliever, the grave is filled with fire. Then he said, "Shall I not tell you who is the worst servant of Allah? Every harsh and arrogant person." "Shall I not tell you about the best servants of Allah? Every weak person who is oppressed, who wears old sheets, but is such that if he swears by Allah's name for something, Allah surely fulfills his oath."