For He has strengthened and made hard the bars of your gates, and He has blessed your children within you.
Your castles and strongholds shall have bars of iron and bronze, and as your day, so shall your strength, your rest and security, be.
Then Ehud went out into the vestibule and shut the doors of the upper room upon [Eglon] and locked them.
2 Samuel 13:17
He called the servant who served him and said, Put this woman out of my presence now, and bolt the door after her!
2 Samuel 13:18
Now [Tamar] was wearing a long robe with sleeves and of various colors, for in such robes were the king's virgin daughters clad of old. Then Amnon's servant brought her out and bolted the door after her.
We found the prison quite safely locked up and the guards were on duty outside the doors, but when we opened [it], we found no one on the inside.
The cities of the South (the Negeb) have been shut up, and there is no one to open them; all Judah has been carried away captive, it has been wholly taken captive and into exile.
Song of Solomon 4:12
A garden enclosed and barred is my sister, my [promised] bride -- "a spring shut up, a fountain sealed.
A brother offended is harder to be won over than a strong city, and [their] contentions separate them like the bars of a castle.
And the sword shall rage against and fall upon their cities and shall consume the bars of their gates and shall make an end [of their defenses], because of their own counsels and devices.
I will break also the bar [of the gate] of Damascus and cut off the inhabitant from the plain of Aven or On, and him who holds the scepter from Beth-eden; and the people of Syria [conquered by the Assyrians] shall go into exile to Kir, says the Lord.
But Samson lay until midnight, and [then] he arose and took hold of the doors of the city's gate and the two posts, and pulling them up, bar and all, he put them on his shoulders and carried them to the top of the hill that is before Hebron.
Behold, your troops in the midst of you are [as weak and helpless as] women; the gates of your land are set wide open to your enemies [without effort]; fire consumes your bars.