The Bread That Changed Their Eyes
Parnassah
On the pasuk where Bnei Yisroel first saw the mon and said "Mon hu," the Rav of Batishan taught in the name of the Apta Rav that it can be read as "Who are you?" They no longer recognized one another. Before, they had complaints about each other, and arguments over parnossah caused anger and strife. Now they were united in friendship and closeness. Moshe told them that this change came from the bread Hashem had given them. Once they saw that their livelihood came from Him and not from each other, they could see one another in a new light.
Source: Bigdei Yesha 12, p. 18b, cited in Yalkut Ohev Yisroel (on Shemos 16:15)