'Themselves' in the Bible

I said in my heart, It is because of the sons of men, that God may prove them, and that they may see that they themselves are but as beasts.

If the clouds be full of rain, they empty themselves upon the earth; and if a tree fall toward the south, or toward the north, in the place where the tree falleth, there shall it be.

in the day when the keepers of the house shall tremble, and the strong men shall bow themselves, and the grinders cease because they are few, and those that look out of the windows shall be darkened,