1 Nephi 8

 In Lehi's vision of the Tree of Life, he sees - 

"And it came to pass that I beheld others pressing forward, and they came forth and caught hold of the end of the rod of iron; and they did press forward through the mist of darkness, clinging to the rod of iron, even until they did come forth and partake of the fruit of the tree.

25 And after they had partaken of the fruit of the tree they did cast their eyes about as if they were ashamed."  (1 Nephi 8:24–25)

Of all groups of people mentioned in the vision, for me, this seems the most troubling.  I see many return missionaries that my fit this description