it is none of my business, I have nothing to do with it (see Molina; example given in the first person)
Alonso de Molina:
aquen nopan. no me toca esse negocio, ni tengo cuenta con el. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 7r. col. 2. Thanks to Joe Campbell for providing the transcription.