The Greek verb diallasso means to reconcile, make peace between parties, or exchange from a state of enmity to one of friendship. It is a stronger form of allasso (to change), with dia intensifying the completeness of the exchange.
Diallasso appears in Matthew 5:24, where Jesus commands reconciliation with one's brother before bringing an offering to the altar. This teaching is startling: the vertical relationship with God is conditioned by the horizontal relationship with one's neighbor. Worship offered without reconciled relationships is unacceptable. The word captures the relational essence of the Kingdom — transformed human relationships flowing from transformed hearts.