וָאָקֻ֥ם בַּבֹּ֛קֶר לְהֵינִ֥יק אֶת־בְּנִ֖י וְהִנֵּה־מֵ֑ת וָאֶתְבּוֹנֵ֤ן אֵלָיו֙ בַּבֹּ֔קֶר וְהִנֵּ֛ה לֹֽא־הָיָ֥ה בְנִ֖י אֲשֶׁ֥ר יָלָֽדְתִּי׃
미명에 내가 내 아들을 젖 먹이려고 일어나 본즉 죽었기로 내가 아침에 자세히 보니 내가 낳은 아들이 아니더이다 하매
Tze'enah Ure'enah
“When I awoke in the morning to nurse my son, etc.” [3:21]. When I woke up in the morning, I saw and understood from his face that this is not my son to whom I had given birth.
Rashi
I scrutinized him. I concentrated to scrutinize him.25And therefore I am certain of not making a mistake.