The American Heritage® Dictionary of the English Language, 4th Edition
pronoun. Those ones identical with you:
pronoun. Used reflexively as the direct or indirect object of a verb or as the object of a preposition: Help yourselves. Have yourselves a good time. You should all watch out for yourselves.
pronoun. Used for emphasis: You should take care of the matter yourselves.
pronoun. Used in an absolute construction: Yourselves having run the race, you four should receive the prize.
pronoun. Your normal or healthy condition: Just relax and be yourselves. See Usage Note at myself.
pronoun. you (used as the object of a verb or preposition, referring to the people being spoken to, previously mentioned).
Word Usage
"Observe the Apostle's phrase; "Yield yourselves," [Greek: parastêsate heautous]: not, "yield to God" (though that is implied), but, "yield _yourselves_, hand yourselves over, to God," as you would hand over a tool, a weapon [Rom. vi."