A.T. Robertson Commentary James 2:12

"So speak ye, and so do, as men that are to be judged by a law of liberty." — James 2:12 (ASV)

So speak ye, and so do (ουτως λαλειτε κα ουτως ποιειτε). Present active imperatives as a habit. For the combination see 1:19-21 contrasted with 1:22-25, and 1:26 with 1:27.

By a law of liberty (δια νομου ελευθεριας). The law pictured in 1:25, but law, after all, not individual caprice of "personal liberty." See Ro 2:12 for this same use of δια with κρινω in the sense of accompaniment as in Ro 2:27; 4:11; 14:20. "Under the law of liberty."