Who is the disbeliever whose body does not decay?

Al-Bukhari narrated from Abu Hurairah that the Prophet, peace and blessings be upon him, said: "While a man was walking, admiring himself in his garment, with his hair combed, Allah caused the earth to swallow him, and he will continue to sink into it until the Day of Resurrection." Therefore, the earth will not consume the body of this man.