'Themselves' in the Bible

In the same way the Lord also directed those who proclaim the Good News to maintain themselves by the Good News.

Otherwise what will become of those who got themselves baptized for the dead? If the dead do not rise at all, why are these baptized for them?

And I beseech you, brethren--you know the household of Stephanas, how they were the earliest Greek converts to Christ, and have devoted themselves to the service of God's people--