Imam Mahdi Ahs has said that the
"Trust (tawakkul) for food on Allah is no Trust as,"
Allah has already promised that "There is nothing that moveth on earth, the nourishment of which doth not depend on Allah..." (S.11 : 6 SAL).
This is a promise by Allah. Whoever has faith in this promise, he is a mumin (believer). otherwise, he is a kafir (infidel). This is so because when a kafir makes a promise that he would make you his guest today, you will remain hungry the whole day, and do not eat anything. The promise is of Allah and His promise is (more) reliable.
(Insaaf Nama - Matan Sharif, N_21)