Tafsir of Al-Haqqah 69:46

And then We certainly would have cut off Al-Watin from him, Ibn `Abbas said, "It (Al-Watin) refers to the artery of the heart, and it is the vein that is attached to the heart.'' This has also been said by `Ikrimah, Sa`id bin Jubayr, Al-Hakim, Qatadah, Ad-Dahhak, Muslim Al-Batin and Abu Sakhr Humayd bin Ziyad. Muhammad bin Ka`b said, "It (Al-Watin) is the heart, its blood, and whatever is near it.'' Concerning Allah's statement,

فما منكم من أحد عنه حاجزين