Source: Tafseer al-Baghawee: "Ma'aalim at-Tanzeel" of al-Imaam, the Reviver of the Sunnah, Aboo Muhammad al-Husayn bin Mas'ood al-Baghawee, died 516 AH.
Imaam al-Baghawee (rahimahullaah) states in his Tafseer of Ayaah 6 of Soorah al-Baqarah:
His Saying: "Verily, those who disbelieve" (al-Baqarah:6), meaning: the Arab Polytheists. Al-Kalbee said: "Meaning: the Jews." And Al-Kufr (unbelief) is al-Juhood (rejection), and its origin is from al-Kufr, and that means to conceal. And the night is referred to as kaafir, because it conceals things with its darkness.
