Genesis 20:3

“But God came to Abimelech in a dream by night, etc.] Put a dream into his mind, by which he cautioned him against taking Sarah to be his wife; so careful was the Lord that no wrong should be done to such a godly and virtuous person, to which she was exposed through the weakness of her husband. Aben Ezra wrongly interprets this of an angel, when it was God himself: and said unto him, behold, thou [art but] a dead man, for the woman which thou hast taken; that is, God would punish him with death, unless he restored the woman, whom he had taken, to her husband; not for any uncleanness he had committed with her, but for taking her without her free and full consent, and without inquiring more…”

“But God came to Abimelech in a dream--In early times a dream was often made the medium of communicating important truths; and this method was adopted for the preservation of Sarah.”

“- 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…”

“20:3-7 God gave Abimelech a stern warning against committing adultery; it was a capital offense (cp. Exod 20:14), viewed throughout the ancient Near East as a “great sin” (Gen 20:9). 20:3 that night God came . . . in a dream: God urgently intervened to stop Abimelech from violating Sarah’s purity shortly before God’s promise was fulfilled (18:10; 21:1-3).”