What is the explanation of the Hadith: "The similitude of the believers in their mutual love, mercy, and compassion is like that of a single body; if one of its limbs aches, the entire body responds to it with sleeplessness and fever"?

This is an authentic Hadith in which the Prophet, peace and blessings be upon him, likened the believers to a single body. This signifies the utmost solidarity, harmony, and mutual affection. The point of resemblance is the agreement in experiencing both hardship and ease, and the mutual summoning of its parts to participate in everything that befalls it.