He replied:

"The Family of Ya-Sin (Al Yasin) are the Family of Muhammad. As for the Book (Al-Kitab), it is Muhammad [the Name/The Personified Book], according to His saying: {We have not neglected anything in the Book} ¹ , and His saying: {This is Our Book which speaks against you with truth} ² ."

And His saying (Blessed is His Name):

{Not a leaf falls but He knows it, nor a grain in the darkness of the earth, nor anything moist or dry, but is in a Clear Book} ³ .

And His saying, narrating what the disbelievers will say on the Day of Revelation:

{Woe to us! What a book this is! It leaves out nothing, small or great, but has recorded it} ⁴ .