佛說觀佛三昧海經 7.32

7.32

「佛滅度後，如我所說觀佛影者，是名真觀如來坐。觀如來坐者，如見佛身等無有異，除百千劫生死之罪。若不能見，當入塔觀一切坐像，見坐像已懺悔障罪。此人觀像因緣功德，彌勒出世，見彌勒佛初始坐於龍華樹下結加趺坐，見已歡喜，三種菩提隨願覺了。

After the Buddha's parinirvāṇa, those who contemplate the Buddha's shadow as I have spoken are called those who truly contemplate the Tathāgata sitting. Those who contemplate the Tathāgata sitting are no different from seeing the Buddha's body; it eliminates the sins of birth and death of hundreds of thousands of kalpas. If they are unable to see it, they should enter a stūpa and contemplate all sitting images. Having seen the sitting images, they should repent of their obscuring sins. By the merit of this person's condition of contemplating the image, when Maitreya appears in the world, they will see Maitreya Buddha initially sitting cross-legged beneath the dragon-flower tree; having seen him, they will rejoice, and according to their vows they will awaken to the three kinds of bodhi.