佛說佛名經 3.15

3.15

"Regarding the fourth, contemplating the Tathāgata's body: it is unconditioned and tranquil-luminous, transcending the four extremes and cutting off the hundred negations, completely endowed with all virtues, serene and ever-abiding. Although through skillful means he enters extinction, in his compassion he rescues and receives [beings] without abandoning them for even a moment. When one gives rise to such a thought, it can be called the excellent ford for eradicating offenses and the essential practice for eliminating obstacles. Therefore, disciples, on this day with utmost sincerity prostrate and pay namas to the Buddha.