(15) When Joseph’s brothers saw that their father was dead, they said, “What if Joseph still bears a grudge against us and pays us back for all the wrong that we did him!”(16) So they sent this message to Joseph, “Before his death your father left this instruction:(17) So shall you say to Joseph, ‘Forgive, I urge you, the offense and guilt of your brothers who treated you so harshly.’ Therefore, please forgive the offense of the servants of the God of your father.” And Joseph was in tears as they spoke to him.

שא נא לפשע עבדי אלהי אביך NOW, PRAY, FORGIVE THE TRESSPASS OF THE SERVANTS OF THE GOD OF THY FATHER — After having repeated to Joseph the words which his brothers stated had been their fathers message, “forgive thy brothers’ sin” the messengers were to add as a petition of the brothers “Now, pray etc.”, meaning “If you will not forgive them although they are your brothers, forgive them because they are the servants of the God of thy father”, implying though your father be dead, his God still lives and they are his servants.

Rabbi Yosei bar Ḥanina said: Anyone who asks forgiveness of his friend should not ask more than three times, as it is stated: “Please, please forgive the transgression of your brothers and their sin, for they did evil to you. And now, please forgive” (Genesis 50:17). The verse uses the word please three times, which shows that one need not ask more than three times, after which the insulted friend must be appeased and forgive. And if the insulted friend dies before he can be appeased, one brings ten people, and stands them at the grave of the insulted friend, and says in front of them: I have sinned against the Lord, the God of Israel, and against so-and-so whom I wounded.

(18) His brothers went to him themselves, flung themselves before him, and said, “We are prepared to be your slaves.”(19) But Joseph said to them, “Have no fear! Am I a substitute for God?(20) Besides, although you intended me harm, God intended it for good, so as to bring about the present result—the survival of many people.(21) And so, fear not. I will sustain you and your children.” Thus he reassured them, speaking kindly to them.

וידבר אל לבם means HE SPOKE words that found ready entrance INTO THEIR HEART: Before you came down hither people spread rumours about me that I was born a slave; through you it became public that I am a free-man by birth. If I were to kill you what would people say? “He saw a party of fine young men and he prided himself on his relationship with them, saying “These are my brothers”, but afterwards he killed them. Have you ever heard of a man killing his brothers?!” (Genesis Rabbah 100:9) Another interpretation is: He said to them, “Ten lights could not extinguish one light; how, then, can one light extinguish ten lights?” (Megillah 16b).