And if a kingdom be divided against itself, that kingdom cannot stand.

Judges 9:23 And the Lord sent a very evil spirit between Abimelech and the inhabitants of Sichem; who began to detest him,

*etc:

Judges 12:1-6 But behold there arose a sedition in Ephraim. And passing towards the north, they said to Jephte: When thou wentest to fight against the children of Ammon, why wouldst thou not call us, that we might go with thee? Therefore we will burn thy house. . . .

2 Samuel 20:1,6 And there happened to be there a man of Belial, whose name was Seba, the son of Bochri, a man of Jemini: and he sounded the trumpet, and said: We have no part in David, nor inheritance in the son of Isai: return to thy dwellings, O Israel. . . .

1 Kings 12:16 Then the people, seeing that the king would not hearken to them, answered him, saying: What portion have we in David? or what inheritance in the son of Isai? Go home to thy dwellings, O Israel: now, David, look to thy own house. So Israel departed to their dwellings.

*etc:

Isaiah 9:20,21 And he shall turn to the right hand, and shall be hungry: and shall eat on the left hand, and shall not be filled: every one shall eat the flesh of his own arm: Manasses Ephraim, and Ephraim Manasses, and they together shall be against Juda. . . .

Isaiah 19:2,3 And I will set the Egyptians to fight against the Egyptians: and they shall fight brother against brother, and friend against friend, city against city, kingdom against kingdom. . . .

Ezekiel 37:22 And I will make them one nation in the land on the mountains of Israel, and one king shall be king over them all: and they shall no more be two nations, neither shall they be divided any more into two kingdoms.

Zechariah 11:14 And I cut off my second rod that was called a Cord, that I might break the brotherhood between Juda and Israel.

John 17:21 That they all may be one, as thou, Father, in me, and I in thee; that they also may be one in us: that the world may believe that thou hast sent me.

1 Corinthians 1:10-13 Now I beseech you, brethren, by the name of our Lord Jesus Christ, that you all speak the same thing and that there be no schisms among you: but that you be perfect in the same mind and in the same judgment. . . .

Ephesians 4:3-6 Careful to keep the unity of the Spirit in the bond of peace. . . .