One example of obedience that God requires to be saved is repentance of ones sins,
Jesus said,
Matthew 12:41,
-The men of Nineveh will rise up in the judgement with this generation and condemn it, because they repented at the preaching of Jonah; and indeed a greater than Jonah is here.
Now look what the word refers to as Nineveh's repentance.
Jonah 3:10,
-Then God saw their works that they turned from their evil ways; and God relented from the disaster that He said He would bring on them and He did not do it.
Their work of repentance is why God's mind was changed...why God choose not to destroy them.
Likewise God requires us to obey the commandment to repent,
Acts 17:30,
-Truly these times of ignorance God overlooked but now commands All men everywhere to repent.
Without this obedience to Gods commandment to repent you cannot be saved by Gods grace.
Nineveh would have been destroyed by God if they did not repent.
Likewise no repentance i.e. stopping willful sin, submitting our lives to Christ, no forgiveness from God.
2Corinthians 7:10,
-For godly sorrow produces repentance leading to salvation, not to be regretted;
but the sorrow of the world produces death.
That is Paul saying repentance leads to salvation. Paul did not teach faith and no repentance to be saved.