Symmerízomai (συμμερίζομαι) means to share in something together, to partake jointly. From syn (together) + merizō (to divide/share).
First Corinthians 9:13: those who serve at the altar 'share in' what is offered on the altar. Paul argues that gospel ministers deserve material support, though he voluntarily waives this right. Ministry creates a community of mutual participation. Those who receive spiritual blessing have responsibility to share materially (Romans 15:27; Galatians 6:6). The early church's radical generosity was evidence of genuine koinōnia.