Midrasch zu Bereschit 50:14

(8) "And Joseph returned to Egypt" (Genesis 50:14) [...they said, "What if Joseph still bears a grudge against us and pays us back for all the wrong that we did him?" (Genesis 50:15)] - Rabbi Levi and Rabbi Yitzchak [disagreed on the interpretation]: Rabbi Levi said: "He did not invite them to dine [with him]" Rabbi Tanchuma said: "He intended nothing other than for the sake of Heaven [by his actions] in that [he thought] 'in the past, father seated me above Judah and he is [to be the ancestor of] a king and above Reuvein who is the firstborn. And now, is it not reasonable that I should sit above them?' But they did not say such, but rather "What if Joseph still bears a grudge (Genesis 50:14)" -- Rabbi Yitzchak said "He went and peered into that pit [while in Canaan to bury their father]." 'And they commanded to Joseph saying, "Your father commanded..."' (Genesis 50:16)" It was taught: Rabban Shimon Gamliel says, "Peace is great, as even the tribes [i.e. brothers] spoke invented words in order to bring peace between Joseph and the tribes. This is what is written (in Genesis 50:16), 'And they commanded to Joseph saying... [Your father commanded before his death]'. And where did he command? We do not find that he commanded!" "Such you shall say to Joseph..." (Genesis 50:17) He said: "Thus my brothers suspect me." "And his brothers also went" (Genesis 50:18) They said to him: "You wanted one [i.e. Benjamin] to be yours for a slave - here, all of us are yours for slaves!"