Paul uses the word "gospel" here to mean his preaching of the gospel. Alternate translation: "as I began to preach the gospel" (See: [[rc://en/ta/man/translate/figs-metonymy]])
This double negative emphasizes that the Philippians were unique. Alternate translation: "the only church that supported me in the matter of giving and receiving was you" or "you were the only church that sent me money or helped me" (See: [[rc://en/ta/man/translate/figs-doublenegatives]])