Acts 5:39

but if it be of God, ye cannot overthrow it; and in that case would be found fighters against God.

Acts 23:9

And a great clamour arose: and the scribes rising up who were of the party of the Pharisees, contended stoutly, saying, We find no fault in this man: but if a spirit have spoken to him, or an angel, let us not fight against God.

Treasury of Scripture Knowledge

Summary

{A Psalm of David.} Plead my cause, O LORD, with them that strive with me: fight against them that fight against me.

Bible References

Fight

Acts 5:39
but if it be of God, ye cannot overthrow it; and in that case would be found fighters against God.
Acts 23:9
And a great clamour arose: and the scribes rising up who were of the party of the Pharisees, contended stoutly, saying, We find no fault in this man: but if a spirit have spoken to him, or an angel, let us not fight against God.