What do you mean by obedience? There are those who obey outwardly. i.e. even the Pharisees were noted for their obedience in the outward sense. We have some examples of this in the Parable of the Sower, there are those noted who obey outwardly. Matthew 13; Mark 4; Luke 8. Matthew 23:28 speaks of those who outwardly appear righteous but inwardly are full of hypocrisy. And Romans 2:28 again speaks of outward signs.

We need to distinguish outward conformity with an inward conformity which would be an obedience of faith.

Consider that with what was said by John the Baptist in Matthew 3:8. The unregenerate in one sense can "obey" many aspects of God's law yet they are not in keeping with repentance because they are done outwardly and there is no inward obedience, seen by a lack of repentance.