Genesis 20:1 And Abraham journeyed from thence toward the south country, and dwelled between Kadesh and Shur, and sojourned in Gerar. 2 And Abraham said of Sarah his wife, She is my sister: and Abimelech king of Gerar sent, and took Sarah. 3 But God came to Abimelech in a dream by night, and said to him, Behold, thou art but a dead man, for the woman which thou hast taken; for she is a man's wife.
Even though God can never approve, or countenance falsehood of any kind, yet, in our frail humanity, we can understand why Abraham and Sarah went that route. They were now entering a foreign country, Sarah was very good looking, and as a stranger, Abraham might become a victim of the malice of the Egyptians. This reasoning is along strictly logical modes of thought and premonition, which often squishes faith into playing second fiddle.
Yet, Abraham may be given a pass in this circumstance, because of anticipated or associated risk. However, if it was a one-time occurrence only, some may blink, but if this pattern of behavior emerges over and over again, it cannot be reckoned as an aberration; it will have to be considered as collusion with intent, as observed in the following verses.
The reason Abraham gives to Abimelech does not in any way justify his course of action, but when confronted by the king, instead of bowing out, he digs in his heels even deeper, and continues to affirm that Sarah is his sister, which, by the way, is partly true, but a half truth is a full-blown lie in God’s sight.
Genesis 20:12 And yet indeed she is my sister; she is the daughter of my father, but not the daughter of my mother; and she became my wife.
May The Lord add His blessing to the study of His word. God bless!