
This painting is located on the right side of the barrel-vaulted ceiling in the main chamber. According to the Dharmapadavadana Sutra, before Rahula was enlightened, he often lied and was dishonest. The Buddha used a metaphor of the dirty water from washing feet to teach him a lesson.
This painting illustrates the scene where Rahula washes the Buddha’s feet while conversing with him. The Buddha, in a monastic robe and seated on a rectangular throne, is depicted in the center of the painting. The Buddha sits sideways facing Rahula, who kneels and gazes at the Buddha while listening to his words. Behind the Buddha on the left side of the painting is a box which contains seven vases and jars, presumably used for washing.
For more details, go to the Encyclopedia of Buddhist Arts: Caves R-L, page 532.