This is a double negative. You can translate it in a positive form. Alternate translation: "Pay all you owe to everyone, and love one another" (See: [[rc://en/ta/man/translate/figs-doublenegatives]])
This elliptical command includes the idea of "owe" from earlier in the sentence. Owing things or service to other people is a metaphor for the duty Christians have, in this case to love one another. Alternate translation: "anything, but remember that God has given you the duty to love one another" (See: [[rc://en/ta/man/translate/figs-ellipsis]])