ANSWER: The original word occurs only in this prayer. Hence its meaning is doubtful. Some say "bread of our necessity," others say "for sustenance"; still others say "food for the morrow." Thus Christ does not allow us to go beyond the absolute necessity of the nearest future in our prayers for temporal things. This interpretation harmonizes finely with Matt. 6:34, which forbids anxiety for the morrow after having prayed for its supply. I think your pastor is correct.
— Steele's Answers pp. 264, 265.