佛說處處經 1.14

1.14

"That when the Buddha first attained the Way he did not eat for seven days is due to four nidānas: first, contemplating the Way, he forgot food; second, with single-mindedness, he was not hungry; third, with joy, he was not thirsty; fourth, he did not dwell upon feeling, perception, volitional formations, and consciousness; these are the four. He wishes to cause people who listen to the sūtras to be likewise.