Prophet's Crying

I saw the Messenger of Allah (may Allah's peace and blessings be upon him) praying and making a sound like the rumbling of a mill because of weeping

‘Abdullāh ibn Ash-Shikhkhīr (may Allah be pleased with him) reported: I saw the Messenger of Allah (may Allah's peace and blessings be upon him) praying and making a sound like the rumbling of a mill because of weeping.