'Power' in the Bible

But Abram said to Sarai, “Behold, your maid is in your power; do to her what is good in your sight.” So Sarai treated her harshly, and she fled from her presence.

It is in my power to do you harm, but the God of your father spoke to me last night, saying, ‘Be careful not to speak either good or bad to Jacob.’

“Reuben, you are my firstborn;My might and the beginning of my strength,Preeminent in dignity and preeminent in power.