'Oneself' in the Bible

For the bed is too short {to stretch out on}, and the covering is [too] narrow when wrapping oneself.

Look! They are like stubble; [the] fire burns them completely. They cannot deliver {themselves} from [the] {power} of [the] flame; there is no coal {for warming oneself}, [no] fire before which to sit.

But if I am delayed, [I am writing] in order that you may know how one must conduct oneself in the household of God, which is the church of the living God, the pillar and mainstay of the truth.

Pure and undefiled religion in the sight of our God and Father is this: to look after orphans and widows in their affliction, [and] to keep oneself unstained by the world.