كتاب الطهارة وسننها
Read the English translation first, with the original Arabic directly underneath.
It was narrated that Abu Hurairah said:
"The Messenger of Allah said: 'Most of the torment of the grave is because of urine.'"
أَكْثَرُ عَذَابِ الْقَبْرِ مِنَ الْبَوْلِ