Were there no others who returned to give glory to God, except this foreigner?

This can be a statement. Alternate translation: "There were no others who returned to give glory to God, except this foreigner!" or "God healed ten men, yet only this foreigner came back to give glory to God!" (See: rc://en/ta/man/translate/figs-rquestion and rc://en/ta/man/translate/figs-doublenegatives)

this foreigner

Samaritans had non-Jewish ancestors and they did not worship God in the same way that the Jews did.