'Itself' in the Bible

After they passed the first and second guard posts, they came to the iron gate that leads into the city, which opened to them by itself. They went outside and passed one street, and immediately the angel left him.

But the word of God grew and spread itself.

Neither in the temple, nor in the synagogues, nor in the city itself did they find me carrying on a discussion with anyone or causing a riot.

And falling into a place where two seas met they ran the ship aground, and the prow having stuck itself fast remained unmoved, but the stern was broken by the force of the waves.

As Paul gathered a bundle of brushwood and put it on the fire, a viper came out because of the heat and fastened itself to his hand.