The Long Āgama Sūtra 10.6

10.6

以十五日月滿時，世尊在露地坐，大眾圍遶，竟夜說法，告舍利弗：「今者四方諸比丘集，皆各精勤，捐除眠睡，欲聞說法，吾患背痛，欲小止息，卿今可為諸比丘說法。」

On the fifteenth-day full moon, the Bhagavān sat in an open area with a large assembly surrounding him. After teaching the Dharma all night, he addressed Śāriputra, “The monks have gathered today from the four directions. They’ve all diligently shaken off their sleepiness and want to listen to a Dharma teaching, but I’m suffering from back pain. I’m going to take a break. You can teach the Dharma for the monks now.”