大方便佛報恩經 1.32

1.32

爾時彼佛告諸菩薩言：「善男子！汝往娑婆世界，若見彼佛，應生供養、恭敬、難遭之想。何以故？釋迦如來於無量百千萬億阿僧祇劫，難行苦行，發大悲願：『若我得成佛時，當於穢惡國土，山陵、堆阜、瓦礫、荊棘，其中眾生具足煩惱，五逆十惡，於中成佛而利益之，使斷一切苦，獲一切樂，成就法身，永盡無餘。』其佛本願如是。汝等今往，當如佛往，住如佛住。」

At that time, that Buddha told the bodhisattvas: "Good men, when you go to the Sahā world, if you see that Buddha, you should generate thoughts of making offerings, showing reverence, and perceiving how rare he is to encounter. Why is this? Śākyamuni Tathāgata, throughout immeasurable hundreds of thousands of millions of billions of asaṃkhyeya kalpas, underwent difficult and ascetic practices, and produced a great compassionate vow: 'When I attain Buddhahood, I shall become a Buddha within an impure and evil land of mountains, ridges, mounds, hillocks, rubble, and briars, wherein the sentient beings are fully endowed with afflictions, the five heinous sins, and the ten evil acts, and I shall benefit them, causing them to sever all suffering, obtain all bliss, accomplish the Dharma-body, and extinguish [defilement] forever without remainder.' Such was that Buddha's original vow. As you go now, you should go as a Buddha goes, and abide as a Buddha abides."