Definition & Meaning of "ashes to ashes (, dust to dust)"

What is the origin of the proverb "ashes to ashes" and when to use it?

The origin of the phrase "ashes to ashes" comes from the Christian burial service, specifically the Book of Common Prayer, which states, "earth to earth, ashes to ashes, dust to dust." This expression is used during funerals to emphasize the idea of mortality, reflecting the belief that human beings, after death, return to the earth from which they came. The saying underscores the temporary nature of human life, suggesting that no matter one's status or achievements, death is inevitable, and the body ultimately returns to the earth in the form of dust or ashes. It serves as a reminder of the fleeting nature of life and the certainty of death.