MN 91 Brahmāyusutta, ‘With Brahmāyu’
A discourse about the young brahmin Uttarā going to spend time observing the Buddha so he can report back to his brahmin elder, Brahmāyu.
The Buddha is dubiously perfect, and has the “thirty-two marks of a Great Man”, which include “the torso of a lion”, “legs like an antelope”, palms that rub against his knees “without stooping”, and a penis “enclosed in a sheath”.