But as for you, if you do not pardon, neither will your Father who is in Heaven forgive your transgressions.
When two brothers do not recognize each other, it is like each is exiled from the family unity. The sages taught us that God's Shekinah cannot dwell where there is no unity; in disunity, all are exiled. Joseph was exiled in Egypt, but it is also said that God's Shekinah does not abide on a mourning soul, so through Jacob's continual mourning for Joseph, his whole family was exiled from Hashem's Presence. Only joy, zest for life, and unity between brothers can bring it back down.
King David so beautifully expresses these thoughts in, Oh, how good, how pleasant it is for brothers to live together in harmony. It is like fragrant oil on the head that runs down over the beard, over the beard of Aharon, and flows down on the collar of his robes. It is like the dew of Hermon that settles on the mountains of Tziyon. For it was there that Adonai ordained the blessing of everlasting life (Psalms 133:1-3).
Aaron was known for being a peacemaking force who often worked reconciliation between people within the tribes of Israel. David knew that so he used the anointed High-Priest as a metaphor to tell us that unity between brethren is fluid. It flows everywhere positively affecting everything in its path. From the head, it descends to every part enveloping all with its shine, smoothness, and healthy properties. It is like two mountains on two opposite ends of a country, one sharing its proverbial abundant dew (material blessings) with the other who shares its divinely appointed blessing (spiritual wealth); everything working in perfect harmony.
This is the picture that we see in Joseph and his brothers kissing and reuniting with each other (Genesis 45:15). The son of Rachel acted as a true godly leader. Joseph revealed himself thus putting an end to the four generation old game of concealed identities. He also forgave his brothers stopping the never-ending returning measure of evil for evil. Unity is restored; Hashem is now able to bless Israel and send it to its destiny of growing into the powerful nation that will eventually teach the whole world about Him.
May we learn from this. As disciples of Yeshua, we have a job to do of sharing the Spirit of His mission to everyone. We therefore do not have the right to indulge in grudges; it is actually forbidden by the Torah (Leviticus 19:18). The sages mentioned that even entertaining grudges in our hearts was sinful, thus agreeing with the Master (Matthew 5:21) who even implied that holding grudges against our brothers nullifies our offerings and prayers (Matthew 5:23-24).
It is funny how in English we use the term 'holding' a grudge; all we have to do is let go of it!