This is an unhappy expression, bringing in the name of God where it does not occur. In the O.T. it is chalilah, 'far be it.' Ge 44:7,17, etc. In the N.T. ?? ???????, 'let it not be.' Ro 3:4,6,31, etc.
And they said unto him, Wherefore speaketh my lord such words as these? Far be it from thy servants that they should do such a thing.
And he said, Far be it from me that I should do so: the man in whose hand the cup is found, he shall be my bondman; but as for you, get you up in peace unto your father.
God forbid: yea, let God be found true, but every man a liar; as it is written, That thou mightest be justified in thy words, And mightest prevail when thou comest into judgment.
God forbid: for then how shall God judge the world?
Do we then make the law of none effect through faith? God forbid: nay, we establish the law.
American Standard Version Public Domain