But if it be discovered that these two have become guilty of sin, then let two others stand in their place from among those (heirs) against whom the (former) two (witnesses) who were in a better position (to give true evidence) are sinfully deposed, and the two (latter witnesses) swear by Allâh (saying), `Surely, our testimony is truer than the testimony of those two and we have not exceeded the bounds of justice (in bearing the evidence) for, in that case, we shall certainly be of the wrongdoers.'