'Themselves' in the Bible

Do ye not know that unrighteous persons shall not inherit the kingdom of God? Do not err: neither fornicators, nor idolaters, nor adulterers, nor those who make women of themselves, nor who abuse themselves with men,

But if they have not control over themselves, let them marry; for it is better to marry than to burn.

But I beseech you, brethren, (ye know the house of Stephanas, that it is the first-fruits of Achaia, and they have devoted themselves to the saints for service,)