Rashi on Breishit 50:16 comments on the beginning of the verse "Our father commanded.." that Ya'akov made no such command, but the brothers said this because of peace and that Yosef was not suspect in his eyes."
Suspect of what??
They told him that Yaakov left a request of him to forgive the brothers and not take revenge on them as recorded in the next passuk. Rashi is saying that Yaakov never suspected Yosef of harboring vengeful thoughts, And never left this command. However the brothers misrepresented the truth in order to guaranty themselves peace. They apparently did suspect Yosef might take revenge on them if not for his father commanding otherwise.