The question is how do you defraud your brothers and sisters Sexually.

What is the meaning of "his own vessel" and "defraud his brother" in 1 Thess 4:3-8?

1 Thes 4:3-8 For this is the will of God, your sanctification: that you should abstain from sexual immorality; that each of you should know how to possess his own vessel in sanctification and honor, not in passion of lust, like the Gentiles who do not know God; that no one should take advantage of and defraud his brother in this matter, because the Lord is the avenger of all such, as we also forewarned you and testified. For God did not call us to uncleanness, but in holiness. Therefore he who rejects this does not reject man, but God, who has also given us His Holy Spirit.

I have two questions:

1) What is "his own vessel" in this context?

2) What does it mean to "defraud his brother in this matter"?

1 Thessalonians 4:6, KJV: That no man go beyond and defraud his brother in any matter: because that the Lord is the avenger of all such, as we also have forewarned you and testified.

The Greek phrase from which we get the English phrase "to possess one's own vessel" is probably better translated "how to acquire (get for himself) his own vessel"; that is, that each Christian man should have his own wife so as to avoid fornication ( 1 Thessalonians 4:3 and 1 Corinthians 7:2 ).

The emphatic position of "his own" in the Greek, the use of "vessel" for wife in 1 Peter 3:7, common Jewish phraseology, and the correct translation "acquire": all these justify this rendering Romans 6:19 , 1 Corinthians 6:15 1 Corinthians 6:18 ). Thus, "his own" stands in opposition to dishonoring his brother by lusting after his wife ( 1 Thessalonians 4:6 ).

As for the phrase "to defraud his brother," it could mean to go beyond or transgress the bounds of rectitude in respect to his brother in Christ. "defraud" could just as easily read "overreach." "take advantage of".

The "matter" is the conjugal honor of his neighbor as a husband to his wife. First Thessalonians 4:4 and 1 Thessalonians 4:7 also confirm this view. Furthermore, the word "brother" enhances the enormity of the crime, which could be adultery (though the text does not say this but uses the generic "sexual immorality"), or having sex with a sister or other close relative of a brother in Christ (compare Proverbs 6:27-33 ).

Chapter 4 starts with an encouragement for the Thessalonian believers to continue their spiritual growth. Their conduct is exemplary, but they need to seek to do even more. Paul especially emphasizes the importance of sexual purity, as well as the need for believers to live peaceful, polite, and productive lives. Paul then begins to discuss the subject of Christ's return. This begins with a reassurance that believers who have died prior to the return of Christ will be the first ones raised when He comes back for His people. Next will be those still living, all of whom will meet Jesus ''in the air.'' Knowledge of our eternal destiny should be encouraging!

The context of this verse is Paul's strong endorsement of sexual morality (1 Thessalonians 4:3–5). Here, Paul makes the point that sexual immorality not only violates God's law, it harms the other person involved. This is a point often missed in modern discussions on sex; the common claim is that one's sexual behavior "isn't hurting anyone." According to Scripture, however, it's not only sin against God, it's harmful to the people who engage in it. As such, Paul assures his readers that God judges those who engage in sexual immorality. When he was in Thessalonica, he had taught the believers to avoid sexual immorality and had warned them about the consequences of such behavior.

In Romans 1:18 Paul teaches that God's wrath is against all who suppress the truth and practice ungodliness and unrighteousness. In Romans 1:24–7 he specifically cites homosexuality as an example of the impurity God's wrath targets. Genesis 18 and 19 record the account of God's retribution on Sodom and Gomorrah, two cities renowned for sexual sins among other atrocities. In His wrath, God destroyed both cities by raining down sulfur and fire. Genesis 19:25 reports the complete devastation that occurred: "And he overthrew those cities, and all the valley, and all the inhabitants of the cities, and what grew on the ground." God's warnings about sexual sin are meant to be taken seriously.

First Thessalonians 4:1–8 urges the believers at Thessalonica to recall what Paul said when he was with them. He had taught them how to behave in such a way that they would please God. They were following these instructions well, but Paul challenges them to increasingly become more holy, for this was God's will for them. Each believer was obligated to avoid sexual immorality by controlling his own body, knowing the Lord avenges those who practice sin. Paul insists that to ignore this teaching about sexual immorality is tantamount to rejecting God.