Jeremiah Chapter 50 KJV verse fifteen

"Shout against her round about: she hath given her hand: for her foundations are fallen, her walls are thrown down: for it is the vengeance of the Lord, take vengeance upon her; as she hath done, do unto her".
Just as Babylon destroyed the foundations of the Lord's house, so now her own foundations are fallen. It's called reaping what you've sown. God's house is built upon the foundation of the apostles and prophets (Eph:2:20). For many years, this foundation lay in ruin. The twin ministries of the apostle and prophet were missing from the Church, so the whole house could not be built without them. "And the wall of the City (New Jerusalem) had twelve foundations and in them the names of the twelve Apostles of the Lamb" Rev:21:14. "For lo, the wicked bend their bow, they make ready their arrow upon the string, that they may privately shoot at the upright in heart. If the foundations be destroyed, what can the righteous do?"Psalm 11:2&3
The answer is absolutely nothing. The righteous can do nothing without the proper foundation. The wicked "privately shoot at the upright in heart", in other words, they talk behind their back, they gossip about them and slander them, they bend their bow by speaking curses against the Lord's anointed. They say in their hearts "let us break their bands asunder and cast away their cords from us" Psalm 2:3. In other words, let us cast Righteousness away from us. These are they God is giving over to a reprobate mind.
So God's response is, as she hath done, so do unto her. As she has spoken against God, and his anointed, so speak out against her. He said to his apostles, whosoever sins ye retain are retained, whosoever sins ye remit are remitted. This is an amazing statement from Jesus giving his apostles the same authority he had to remove or retain sin. As they are fully restored to the Body, so will a Godly fear, even as Peter spoke to Ananias and Saphira and they were struck dead.
Ezra and Nehemiah are prophetic books about the great last days move of the Holy Spirit to rebuild and restore the Bride of Christ, the Lord's house, to prepare him a Holy habitation for eternity (the new Jerusalem). This city is made up of living stones, us, both Jew and Greek, as one new man, married to him forever. Ezra 3:6 states "The foundation of the temple was not yet laid", the apostles and prophets had not yet been restored to the Body. Verse eight states "And all they that were come out of captivity unto Jerusalem", these are the ones God has set free from Babylon, gathered together as one, with one purpose, to build God's city, His house, his temple "For ye are the Temple of the Living God" 2 Cor:6:16, "And all the people shouted with a great shout, when they praised the Lord, because the Foundation of the House of the Lord was laid" Ezra 3:11.
We who are free from Babylon, who have moved back to Jerusalem are rejoicing greatly to see the Apostles and Prophets restored to the Body again. Even as the foundation of the Lord's house is being restored with a shout - all false apostles and prophets, pastors and teachers are being exposed and deposed, "For the time is come that judgment must begin at the house of God" 1 Peter 4:17. Even as we shout against Babylon as we did against Jericho, even as we are shouting to see God destroy Babylon, we are shouting for joy at seeing the apostles and prophets restored to the Body, Hallelujah! The shout is a weapon of war very often under utilized in the churches. As we shout, the fruit of Babylon, which is confusion, will come back on her, just as Gideon's army shouted and caused great confusion in the enemy's camp. And Gideon won with a vastly outnumbered army and so shall we, though we are few, because God is with us. As she hath done, do unto her. She uses fear and confusion to keep the saints in bondage so fear and confusion will come upon her. As she bent her bow to shoot against the righteous, as they prophecied and spoke curses against God's apostles and prophets and all who are righteous, so shall God use those same apostles and prophets and righteous sons and daughters to prophecy their destruction. I believe the statement "she has given her hand" is a reference to the fact that Satan's end time strategies to defeat us are being revealed and exposed.