nahui.

Matlacpoaltica, ipan epoalli, in ilhuiuhquiçaia: in ilhuichiuililoia, ilhuiquistililoia: ipã quimattiuia, in itonal itoca naolin. Auh in aiamo quiça ilhuiuh: achtopa, nauilhuitl, neçaoaloia. = Every two hundred and sixty days, when his feast day came, then his festival was honored and celebrated. They observed it on his day sign, called Naui olin. And before his feast day had come, first, for four days, all fasted. (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 7 -- The Sun, Moon, and Stars, and the Binding of the Venus, No. 14, Part VIII, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 1.

4tli nitlanahuatia = Fourth I order (Santa María de la Asunción, Toluca Valley, 1737)
Caterina Pizzigoni, ed., Testaments of Toluca (Stanford: Stanford University Press and UCLA Latin American Center Publications, 2007), 179.

oncan oc nauhxiuhtique yn catca azteca mexitin. ynic oncan motlallico ytzintlan mocehuiaya yn ahuehuetl = Still, the Azteca Mexitin spent four more years there when they settled and rested there at the foot of the cypress (central Mexico, early seventeenth century)
Codex Chimalpahin: Society and Politics in Mexico Tenochtitlan, Tlatelolco, Culhuacan, and Other Nahuatl Altepetl in Central Mexico; The Nahuatl and Spanish Annals and Accounts Collected and Recorded by don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, eds. and transl. Arthur J. O. Anderson and Susan Schroeder (Norman: University of Oklahoma Press, 1997), vol. 1, 70–71.

tlaiecaiotia in tepuzmaquaveque in tlanauhcaiotitivi, tepuztopileque, tzinacātopileque = Third went those with swords. Fourth went those with iron lances, staffs shaped like a bat [halberds] (Mexico City, sixteenth century)
James Lockhart, We People Here: Nahuatl Accounts of the Conquest of Mexico, Repertorium Columbianum v. 1 (Los Angeles: UCLA Center for Medieval and Renaissance Studies, 1993), 148.

nica cate naviti acticate yn icha = Here there are four included in his home. (Cuernavaca region, ca. 1540s)
The Book of Tributes: Early Sixteenth-Century Nahuatl Censuses from Morelos, ed. and transl. S. L. Cline, (Los Angeles: UCLA Latin American Center Publications, 1993), 152–153.

yz ca[te?] yn imecava y to thomas yn [...]catyca chicuacemi y
çe tlacatl ytoca maria tlacu ynic umety ytoca marda xocu yniquety ayamo mocuatequia ytoca teycuh ynic navity camo mocuatequia teycuh ynic macuillty amo [c.q] ytoca necavall ynic chicuacemi [c s'] ytoca magdallena teya[...]pa = Here are the concubines of don Tomás [...] six of them. The first is named María Tlaco, the second is named Marta Xoco. The third, not yet baptized, is named Teicuh. The fourth, not baptized, is named Teicuh. The fifth, not baptized, is named Necahual. The sixth, baptized, is named Magdalena Teya[ca]pan. (Cuernavaca region, ca. 1540s)
The Book of Tributes: Early Sixteenth-Century Nahuatl Censuses from Morelos, ed. and transl. S. L. Cline, (Los Angeles: UCLA Latin American Center Publications, 1993), 110–111.

yc nahuitl = the 4th day (nahuitl combines nahui with ilhuitl, sometimes also seen as nahuilhuitl) (early seventeenth century, central New Spain)
Annals of His Time: Don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, James Lockhart, Susan Schroeder, and Doris Namala, eds. and transl. (Stanford: Stanford University Press, 2006), 70–71.

nauhteme in cavalos = four horse[men] (central Mexico, sixteenth century)
James Lockhart, We People Here: Nahuatl Accounts of the Conquest of Mexico, Repertorium Columbianum v. 1 (Los Angeles: UCLA Center for Medieval and Renaissance Studies, 1993), 220.

ie iacattiuh in cioatl, in qujqua nauhcamatl: ҫatepan qujqualtia in oqujchtli no nauhcamatl = The woman took the lead in eating four mouthfuls; thereafter she also fed the man four mouthfuls (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 6 -- Rhetoric and Moral Philosophy, No. 14, Part 7, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 132.

Auh in oacic navilhvitl: njman inpetl meoa = And when four days had passed, then their straw mat was raised (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 6 -- Rhetoric and Moral Philosophy, No. 14, Part 7, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 132.

nauhuteuhtli chanecatzintli moteneua nauhteuhtlalpa ynic moceteneua auh ynic ticcesotequi yteuati ytinauiti = ante cuatro pri[n]cipales (naturales de los cuatro señoríos) ante quien mandamos todos nosotros cuatro (Coyoacan, "1582" [1687?])
Vidas y bienes olvidados: Testamentos indígenas novohispanos, vol. 2, Testamentos en náhuatl y castellano del siglo XVI, eds., Teresa Rojas Rabiela, Elsa Leticia Rea López, Constantino Medina Lima (Mexico: Consejo Nacional de Ciencias Tecnología, 1999), 254–255.