23 (So then), if you bring your gift to the altar and there (you remember that your brother has something against you,) 24 leave your gift there in front of the altar. First go and be reconciled to your brother and then come and present your gift.Matthew 5:23-24
“So then” refers to something that came before, which in this case would be the teaching of Jesus that unity between believers was very important, vs.17-22. It was so important that it would be better to delay the act of worshipping God to settle the issue. Make note here that the teaching isn’t to forego worship because of anger but to lay ‘it’ aside until there has been reconciliation and then return to worship. Also note that this isn’t talking about you being wronged but about someone who believes you have wronged them in some way. Jesus’ teaching is vital to the unity of the body. The bottom line is. We must care so much about others that we seek to not offend them and to quickly make things right if we do.