A

laurel branches used in penitential offerings (Karttunen); or fir branches (Anderson and Dibble translating Sahagún); or, a rope woven of reeds, branches, or grass
Angel Julián García Zambrano, "Ancestral Rituals of Landscape Exploration and Appropriation among Indigenous Communities in Early Colonial Mexico," in Sacred Gardens and Landscapes: Ritual and Agency, ed. Michel Conan (Washington, D.C.: Dumbarton Oaks Research Library and Collection, Harvard University Press, 2007), 204.

hauling fir branches (a ceremony or ritual)
Fray Bernardino de Sahagún, Primeros Memoriales, ed. Thelma D. Sullivan (Norman: University of Oklahoma Press, 1997), 126.

who are they?

to be full of oneself, presumptuous, haughty (see Molina)

a specific reference to the Adam of the Adam and Eve story of Christianity
Louise M. Burkhart, Before Guadalupe: The Virgin Mary in Early Colonial Nahuatl Literature, Institute for Mesoamerican Studies Monograph 13 (Albany: University at Albany, 2001), 17.

goodbye

to carry out worship

to rain and be windy (see Karttunen)

Lamb of God
(a phrase from Latin)