Swords & Deviltry, by Fritz Lieber, paperback fantasy anthology
“For the first time – the story of how the greatest heroes in fantastic literature first met.
‘The two thieves had themselves been robbed by two youths, who eyed each other suspiciously over the sprawled, senseless bodies.
Fafhrd said: ‘Our motives for being here seem identical.’ ‘Surely, they must be!’ the Mouser answered curtly, fiercely eyeing his huge, potential foe.
Fafhrd glanced down at the belts and money-pouches of the fallen thieves. Then he looked up at the Mouser with an honest, open, ingenuous smile.
‘Sixty-sixty?’ he suggested.
Thus was born the most improbable relationship in the whole history of swords and sorceries.”
The first in the famous series of Fafhrd and the Gray Mouser.”
1971 NEL edition