“once two men came to abu bakar shibli, for the sake of doing bayat; so he told one of them to say

la illaha illa allah shibli rasool allah

so he said

la haul wala quwwata

and abu bakar also said that;

that person asked why did you recite it?

so abu bakar asked him why did you recite it?

he replied;- because i had to come to such a man without shariat for becoming a student

abu bakar replied:- i said because i have disclosed a secret in front of such an illiterate person

[tazkira ghothiyya; page 330]