'Themselves' in the Bible

I said in my heart, "As for the sons of men, God tests them, so that they may see that they themselves are like animals.

If the clouds are full of rain, they empty themselves on the earth; and if a tree falls toward the south, or toward the north, in the place where the tree falls, 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 who look out of the windows are darkened,