yexcan. en tres partes, o lugares. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 36r. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
(Y)ĒXCĀN in three places / en tres partes o lugares (M) [(2)Cf.91r]. There is a variant ĒXCĀN. See (Y)ĒY(I), -CĀN. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 339.