For since the message spoken through angels was binding, and every violation and disobedience received its just punishment
NIV
For if the message given through angels [the Law spoken by them to Moses] was authentic and proved sure, and every violation and disobedience received an appropriate (just and adequate) penalty
AMP
For if the word spoken by angels was stedfast, and every transgression and disobedience received a just recompence of reward;
KJV
