וַיִּרְא֤וּ אֲחֵֽי־יוֹסֵף֙ כִּי־מֵ֣ת אֲבִיהֶ֔ם וַיֹּ֣אמְר֔וּ ל֥וּ יִשְׂטְמֵ֖נוּ יוֹסֵ֑ף וְהָשֵׁ֤ב יָשִׁיב֙ לָ֔נוּ אֵ֚ת כָּל־הָ֣רָעָ֔ה אֲשֶׁ֥ר גָּמַ֖לְנוּ אֹתֽוֹ׃
And when Joseph’s brethren saw that their father was dead, they said: ‘It may be that Joseph will hate us, and will fully requite us all the evil which we did unto him.’
Read kabbalistic (mystical) interpretation of Genesis 50:15: and classical mystical sources.