You: "Which package and what era?"
Answer: THE Law. Christ made reference to it over and over again, for example Mat 5:17.
Your statement about law and grace is gratuitous. I do not suppose that anyone who walks in the Spirit is 'under' the Law.
Paul kept the Law -
"While he answered for himself, Neither against the law of the Jews, neither against the temple, nor yet against Caesar, have I offended any thing at all." (Act 25:8)
and taught others to do the same -
"Do we then make void the law through faith? God forbid: yea, we establish the law." (Rom 3:31)
"Wherefore the law is holy, and the commandment holy, and just, and good." (Rom 7:12)
"For we know that the law is spiritual... " (Rom 7:14a)
According to Christ he will be called great in the Kingdom of Heaven (Mat 5:17-20).
Who needs to do this when you are "keeping the law"?
Luk 18:13
And the publican, standing afar off, would not lift up so much as
his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner.
I very much doubt law-keepers are included in this lot.
Mat 5:1
And seeing the multitudes, he went up into a mountain: and when he was set, his disciples came unto him:
Mat 5:2
And he opened his mouth, and taught them, saying,
Mat 5:3
Blessed
are the poor in spirit: for theirs is the kingdom of heaven.
Mat 5:4
Blessed
are they that mourn: for they shall be comforted.
Mat 5:5
Blessed
are the meek: for they shall inherit the earth.
Mat 5:6
Blessed
are they which do hunger and thirst after righteousness: for they shall be filled.
Mat 5:7
Blessed
are the merciful: for they shall obtain mercy.
Mat 5:8
Blessed
are the pure in heart: for they shall see God.
Mat 5:9
Blessed
are the peacemakers: for they shall be called the children of God.
Mat 5:10
Blessed
are they which are persecuted for righteousness' sake: for theirs is the kingdom of heaven.
Mat 5:11
Blessed are ye, when
men shall revile you, and persecute
you, and shall say all manner of evil against you falsely, for my sake.
Mat 5:12
Rejoice, and be exceeding glad: for great
is your reward in heaven: for so persecuted they the prophets which were before you.
So good luck and happy landings with your "law keeping".
Heb 10:28
Anyone who has rejected Moses’ law dies without mercy on
the testimony of two or three witnesses.
Heb 10:29
Of how much worse punishment, do you suppose, will he be thought worthy who has trampled the Son of God underfoot, counted the blood of the covenant by which he was sanctified a common thing, and insulted the Spirit of grace?