A.T. Robertson Commentary Philippians 4:16

"for even in Thessalonica ye sent once and again unto my need." — Philippians 4:16 (ASV)

Once and again (κα απαξ κα δις). "Both once and twice" they did it "even in Thessalonica" and so before Paul went to Corinth." See the same Greek idiom in 1 Thessalonians 2:18.