"I filled the Eye after it had been injured,
on that day when the two Rivals fought."

"But what is the fighting of the two Rivals ? 

That was the day when Horus and Seth fought, when Seth inflicted a wound on the face of Horus and when Horus carried off the testicles of Seth.

It was Thoth who did this (i.e. filling the Eye) ..."

Coffin Texts, spell 335 (expanded as chapter 17 of the Book of the Dead)