וַיִּקְרָ֤א פַרְעֹה֙ לְאַבְרָ֔ם וַיֹּ֕אמֶר מַה־זֹּ֖את עָשִׂ֣יתָ לִּ֑י לָ֚מָּה לֹא־הִגַּ֣דְתָּ לִּ֔י כִּ֥י אִשְׁתְּךָ֖ הִֽוא׃
And Pharaoh called Abram, and said: ‘What is this that thou hast done unto me? why didst thou not tell me that she was thy wife?
Read kabbalistic (mystical) interpretation of Genesis 12:18: and classical mystical sources.