Genesis 20:2

“And Abraham said of Sarah his wife, she [is] my sister, etc.] This he gave out in all conversation he came into, and said it to every one that asked who she was, which was little better than a lie; it at least was an equivocation and deception, and not at all justifiable, and tended to expose his wife’s chastity, and discovered a distrust of divine Providence; the same infirmity be had given way to, and the same evil he had fallen into in Egypt, (<011211>Genesis 12:11-20), and therefore was the more inexcusable now; good men not only fall into sin, but have their relapses: and Abimelech king of Gerar sent and took Sarah; having heard or seen what a beautiful woman. Sarah was, though ninety…”

“Abraham said of Sarah his wife, She is my sister--Fear of the people among whom he was, tempted him to equivocate. His conduct was highly culpable. It was deceit, deliberate and premeditated--there was no sudden pressure upon him--it was the second offense of the kind [see on Gen 12:13] --it was a distrust of God every way surprising, and it was calculated to produce injurious effects on the heathen around. Its mischievous tendency was not long in being developed. Abimelech (father-king) . . . sent and took Sarah--to be one of his wives, in the exercise of a privilege claimed by Eastern sovereigns, already explained (see on Gen 12:15).”

“- Abraham in Gerar 2. אבימלך .2 'ǎbı̂ymelek, Abimelekh, “father of the king.” 7. נביא nābı̂y' “prophet,” he who speaks by God, of God, and to God, who declares to people not merely things future, but also things past and present, that are not obvious to the sense or the reason; related: “flow, go forth.” 13. התעוּ hı̂t‛û is plural in punctuation, agreeing grammatically with אלהים 'ĕlohı̂ym. ו(w), however, may be regarded as the third radical, and the verb may thus really be singular. 16. נכהת nokachat an unusual form, either for נכחת nokaḥat the second person singular feminine perfect or נכחה nokeḥâh the third person singular feminine perfect, from a verb signifying in hiphil, “make…”

“20:2 Abraham told the same lie to Abimelech that he had told to Pharaoh (12:13); Isaac would later do the same (26:1-11), probably having learned this tactic from his father. • Abimelech (literally my father the king) was probably a title like “Pharaoh” (37:36; Exod 1:15), not a proper name (see study note on Gen 26:1).”