The figurative use of the word in Matthew 18:19 makes it of particular interest. The word there is sumphoneo, where our word symphony comes from, which means a harmonious fusion. So this agreement is complete. Three people are introduced: two people and the father. They fully agree on the subject or purpose in question. It is therefore an inner unity that was engendered by the Holy Spirit and which leads them to such an agreement with the Father. Then, of course, there will be what is promised in Matthew 18:19,20. In Acts 5:9 she sets out how Peter acts in the same way in both cases. Ananias and Sapphira were entirely in agreement and guilty (Luke 5:36; Acts 15:15). This is the meaning of the word in Matthew 20:2; John 9:22 and other passages. In Mark 14:56 the word is isos and has not only the idea that their words did not correspond, but also that the testimony did not correspond to what the law required in such a case. The idea of being equal also takes place in 1 John 5:8.
What is the agreement between the temple of God and the idols? For we are the temple of the living God; As God said: I will make my abode among them, and I will walk among them, and I will be their God, and they will be my people. For you said, «We have made an alliance with death, and we have an agreement with Le Chéol, if the crushing whip passes through him, will not come to us, for we have made lies our refuge, and we have found refuge in lies. Then your covenant with death will be annulled, and your consent with sheol will not exist; If the crushing plague passes, it depresses you. Do not deprive yourself of one another, except perhaps by unity for a limited time, so that you may surrender to prayer; but then you come together so that Satan does not seduce you because of your lack of self-control. . I ask you, brethren, in the name of our Lord Jesus Christ, that you all agree and that there be no divisions between you, but that you be united in the same spirit and in the same judgment. For the people of Chloe told me that there were arguments between you, my brothers. Now the whole earth had a language and the same words. And when people emigrated from the East, they found a plain in the land of Shinar and settled there. And they said to each other, «Come, let`s make bricks, and burn them abundantly.» And they had bricks for stone and bitumen for mortar. And they said, «Come, let us build a city and a tower with its tip in the heavens, and make a name for ourselves, so that we are not scattered all over the earth.» The LORD went down to see the city and the tower that man`s children had built.
… Ecclesiastes 5:1-6, ESV «Protect your steps when you enter the house of God. It is better to approach listening than to offer the sacrifice of fools, because they do not know that they are doing evil. «For the man who does not love his wife, but who separates from her,» said the Lord, the God of Israel, covers his robe with strength, says the Lord of the armies.