Verifying the book’s attribution:
Converging lines of evidence confirm that this work belongs to al-Ḥāfiẓ Ibn Rajab. They are as follows:

First: the statement written on the cover of the manuscript, which explicitly ascribes the book to him. I shall reproduce its exact wording in the next paragraph.

Second: a number of Ibn Rajab’s biographers list this treatise among his writings. Yūsuf ibn ʿAbd al-Hādī says in al-Jawhar al-Munaḍḍad (p. 50) while enumerating his works: “And the book Iʿrāb Umm al-Qurʾān, one volume; it may in fact be the book on the Fātiḥa.” End quote.

Third: several scholars have cited this treatise and attributed it to al-Ḥāfiẓ Ibn Rajab. Among them are:

1 – Al-Mardāwī in al-Insāf, who refers to it in two places:
a) In the Book of Prayer, section on the Description of Prayer, he states (2/48): “There is a report from him—i.e. regarding the basmala—that it is not Qurʾan in any absolute sense; rather, it is a remembrance. Ibn Rajab said in Tafsīr al-Fātiḥa: ‘The authenticity of this report from Aḥmad is open to question.’ ” End quote.
b) In the Book of Marriage, section on marital relations, he said