The only Mon Mothma line anyone remembers of Mon Mothma’s in the original Star Wars trilogy is “Many Bothans died to bring us this information.” With Rogue One: A Star Wars Story being about the Rebellion stealing Death Star plans, everyone keeps making Bothan jokes. Please stop it. Because many Bothans did not die to bring us this specific information.
Source: io9 – Many Bothans Will Not Be Dying in Rogue One