Be reconciled to your brother before going to the altar

Scripture reference

Matthew 5:23–24 (ASV 1901)

23If therefore thou art offering thy gift at the altar, and there rememberest that thy brother hath aught against thee, 24leave there thy gift before the altar, and go thy way, first be reconciled to thy brother, and then come and offer thy gift.

Stories

Jonathan Goforth relates how confession of sin was crucial to revival.
Jonathan Goforth was strongly urged by the Spirit of God to go reconcile with a brother missionary with him he had differences before heading out to preach. And though he stubbornly resisted, God insisted and promised to not be with him on his revival tour until he at last obeyed.
Jonathan Goforth is convicted by the Holy Spirit to go and resolve a disagreement with a fellow missionary. He refuses for several days until one day in the middle of a sermon, he obeys the Holy Spirit, and instantly the audience changed, experiencing an extraordinary weeping and public repentance.
Learning that God had forgiven him his own terrible sins and that there was a link between forgiveness and answered prayers, helped Uong Nguyen forgive the Khmer Rouge for the great evil done him. And the fruit of forgiveness for him was great joy.
Bob Stokes prayed for help to openly ask forgiveness for a momentary flash of sinful anger against a brother. The result of obedience was electrifying.
A beautiful story of clan leaders being reconciled to one another and publicly choosing Christ's Law of Love over their traditions of revenge.
After Pastor Hsi became a follower of Jesus, he overcame great difficulty to be reconciled to his estranged relatives.
Intense hatred within the women's prison led to brutal beatings, but Sabina Wurmbrand challenged them with Matthew 5:23