It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: The Hour will not be established until (it will happen that) a man will pass by another man's grave and say, "Would that I were in his place."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 10866