NET
25 But the one who peers into the perfect law of liberty and fixes his attention there, and does not become a forgetful listener but one who lives it out—he will be blessed in what he does.
Darby
25 But *he* that fixes his view on [the] perfect law, that of liberty, and abides in [it], being not a forgetful hearer but a doer of [the] work, *he* shall be blessed in his doing.
KJV
25 But whoso looketh into the perfect law of liberty, and continueth [therein], he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed.