Matthew 12:30

He who is not with me is against me, and he who does not gather with me scatters.

Luke 9:50

But Jesus said to him, "Do not forbid him, for he that is not against you is for you."

Revelation 2:20-23

Nevertheless I have this against you, that you tolerate the woman Jezebel, who calls herself a prophetess and is teaching and beguiling my servants to practice sexual immorality and to eat food sacrificed to idols.

Treasury of Scripture Knowledge

Summary

Then he wrote a letter the second time to them, saying, If ye be mine, and if ye will hearken unto my voice, take ye the heads of the men your master's sons, and come to me to Jezreel by to morrow this time. Now the king's sons, being seventy persons, were with the great men of the city, which brought them up.

If ye be mine

Your master's sons

Bible References

If ye be mine

Matthew 12:30
He who is not with me is against me, and he who does not gather with me scatters.
Luke 9:50
But Jesus said to him, "Do not forbid him, for he that is not against you is for you."

Your master's sons

Revelation 2:20
Nevertheless I have this against you, that you tolerate the woman Jezebel, who calls herself a prophetess and is teaching and beguiling my servants to practice sexual immorality and to eat food sacrificed to idols.