長阿含經 3.p25

3.p25

“Śakra the Lord of Gods told the Trāyastriṃśa gods, ‘I’ve heard it from the Buddha, personally received it from him, that it’s impossible for two Buddhas to arise in the world at the same time. If the Tathāgata simply remained in the world for a long time, he would have compassion for many and benefit many. Gods and humans would win their peace. The host of gods would increase greatly, and the host of asuras would diminish.’”