Arrogant against Allah

Saidina Abu Bakr (May Allah Be Pleased With Him), wrote a letter to the leaders of Ar-Rum - (Rome)
and part (all) of the letter read;

"How can you be arrogant against Allah? How can you be arrogant against Allah, when you
came from the place where water flow's twice?"

Meaning -
You have come from where a man emits his sperm to create one of Allah's servant and from where
he urinates.
and You have came from the place where a woman gives birth to Allah's servant and where she urinates.