A.T. Robertson Commentary 1 Thessalonians 4:10

"for indeed ye do it toward all the brethren that are in all Macedonia. But we exhort you, brethren, that ye abound more and more;" — 1 Thessalonians 4:10 (ASV)

Ye do it (ποιειτε αυτο). The αυτο refers to το αγαπαιν αλληλους (to love one another). Delicate praise.