Genesis 21:26

Overview - Genesis 21
Isaac is born, and circumcised.
Sarah's joy.
Isaac is weaned.
Hagar and Ishmael are cast forth.
15 Hagar in distress.
17 The angel relieves and comforts her.
23 Abimelech's covenant with Abraham at Beer-sheba.
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Genesis 21:26  (King James Version)
And Abimelech said, I wot not who hath done this thing: neither didst thou tell me, neither yet heard I of it, but to day.

I wot
"Wot," though used for the present, is the past tense of the almost obsolete word "to wit," from the Saxon {witan,} to know.
13:7 2 Kings 5:20-24