Commandment:- G1785 entole? From G1781; injunction, that is, an authoritative prescription: - commandment, precept.
Law:- G3551 nomos From a primary word (nemo)? (to parcel out, especially food or grazing to animals); law (through the idea of prescriptive usage), generally (regulation), specifically (of Moses [including the volume]; also of the Gospel), or figuratively (a principle): - law.
John 3:16 Greek TR "ἔδωκεν ἵνα πᾶς ὁ πιστεύων" The 3rd Greek word here is "pas" transliterated in english.
Strongs defines as... "G3956 πᾶς pas Including all the forms of declension; apparently a primary word; all, any, every, the whole: - all (manner of, means) alway (-s), any (one), X daily, + ever, every (one, way), as many as, + no (-thing), X throughly, whatsoever, whole, whosoever."
Therefore "pas" which means "whosoever" is in the original Greek manuscript as the Textus Receptus correctly provides.