分別功德論 4.38

4.38

所以稱優鉗摩比丘不與人語視地而行第一者，此比丘常患口過，將欲改之，自思惟曰：「正坐此口，生天人中、三塗地獄啾吟喚呼，因備五道更苦無量。我今當如慕魄太子結誓不言，四過三殃何由而生？」既便不言，端視而行。佛奇其能爾，每向諸比丘稱美其德。語阿難曰：「如此比丘，宜存識錄，以率來薄。」以是因緣稱之第一。

The reason why Bhikṣu Uggama was praised as foremost in not speaking with people and walking with his gaze fixed on the ground is that this bhikṣu was constantly distressed by verbal faults. Wishing to reform them, he reflected to himself: 'Precisely because of this mouth, being born among devas and humans, or moaning and crying out in the three paths and the hells, thus running through the five paths, one undergoes boundless suffering. I ought now, like Prince Mūgapakkha, make a vow not to speak; whence then could the four faults and three calamities arise?' Having ceased speaking, he walked looking straight ahead. The Buddha marvelled at his ability to do so, and frequently praised his virtue to the bhikṣus, saying to Ānanda: 'Such a bhikṣu should be preserved in memory and recorded, in order to guide future ages of decline.' Due to these causes and conditions, he was praised as foremost.