Silsilat al-Ahadith al-Sahihah

Sayyiduna Hakim bin Hizam (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings of Allah be upon him) was sitting among his companions when suddenly he said: "Do you hear what I am hearing?" They said: We are not hearing anything. The Noble Prophet (peace and blessings of Allah be upon him) said: "Indeed, I am hearing the creaking of the sky, and it cannot be blamed for creaking, for there is not even a space of a handspan in it where there is not an angel prostrating or standing in prayer."