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.
May it not be! But let God be true, and every man a liar; as it has been written, "That Thou mayest be justified in Thy words; and mayest overcome, when Thou judgest."