Finally therefore, brothers, we ask you and appeal to [you] in the Lord Jesus that, just as you have received from us how it is necessary for you to live and to please God, just as indeed you are living, that you progress even more.
References for 1 Thessalonians 4:1
For you know what commands we gave to you through the Lord Jesus.
For this is the will of God, your sanctification: [that] you abstain from sexual immorality;
[that] each of you know how to possess his own vessel in sanctification and honor,
not in lustful passion, just as also the Gentiles who do not know God;
not to transgress and to exploit his brother in the matter, because the Lord [is] the one who avenges concerning all these [things], just as also we told you beforehand and testified solemnly.
For God did not call us to impurity, but in holiness.
Therefore the one who rejects [this] [is] not rejecting man, but God, [who] also gives his Holy Spirit to you.