Jamieson, Fausset & Brown

Look . . . and be ye saved--The second imperative expresses the result which will follow obedience to the first (Gen 42:18); ye shall be saved (Joh 3:14-15). Num 21:9 : "If a serpent had bitten any man, when he beheld the serpent of brass he lived." What so simple as a look? Not do something, but look to the Saviour (Act 16:30-31). Believers look by faith, the eye of the soul. The look is that of one turning (see Margin) to God, as at once "Just and the Saviour" (Isa 45:21), that is, the look of conversion (Psa 22:27).