'Faithfully' in the Bible

[By] teaching these [things] to the brothers, you will be a good servant of Christ Jesus, trained in the words of the faith and of the good teaching that you have followed faithfully.

But you have faithfully followed my teaching, way of life, purpose, faith, patience, love, endurance,

Dear friend, you act faithfully [in] whatever you do for the brothers, {even though they are strangers}.