Genesis 12: 11-13

Genesis 12: 11-13 shows Abraham engaging in a deception was also disrespecting his wife and putting her at risk. However it needs to be noted that this was not a technically a lie in that as we will later find out Sarah was his half sister being the daughter of his father but not his mother. This would not have caused an inbreeding problem as it does today since there would have been fewer mutations back at this time than even a few hundred years later. That said Abraham was still wrong to engage in such a deception even if was partly true