Among the elite of the companions of Seyidina Ahmed Tidjani (may ALLAH sanctify his precious secret) and those who experienced prodigies in his company, was the jurist, the ascetic, the follower of the path of truth, endowed with the mastery of the knowledge of Law and of the truth, known for his conviction in the Tariqa, Abu Muhammad Sidi Abdelqader Zarhuni, nicknamed El Muhib ibn Qadur (may ALLAH be pleased with him).
Seyyidina Ahmed Tidjani (may ALLAH sanctify his precious secret) sent him the following letter:
"After mentioning the name of ALLAH, we request Him through His immense Majesty and His sacred Names, that, as of this moment, he makes you to travel the path of his virtuous saints. May you be in his hands in the situation of his beloved and knowers, in this world as well as the HereAfter because He is capable of this. Next, you asked for my authorization for additional formulas of evocation. Know that I authorize all the evocation and Names, verses and invocations that you wish for wherever they are and however they are formulated, except for those pertaining to the obligatory litanies of the Shouyoukh in their affiliation to their path.
Know that all the evocation, invocation, and prayers upon the Prophet (peace and blessings be upon him), that you can accomplish in a hundred thousand years would not equal the reward of one single Salatul Fatihi.