yectel. dias ha. aduerbio. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 34v. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
YECTEL a while ago / días ha (M for hace días), los dias pasados (C), el otro dia (C) [(6)Cf.100v,103v,104r,131r]. Although this would appear to be a compound of YĒC-TLI and TĒL, the vowels are unmarked for length in all attestations. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 337.