佛說處處經 1.57

1.57

佛言：「有羅漢，名憍梵鉢，已得阿羅漢道，反作牛飼。」弟子問佛：「何以故？」佛言：「是比丘前世宿命時，七百世作牛，今世得道，餘習未盡故。」

The Buddha said: 'There is an arhat named Gavāmpati who, though having already attained the path of an arhat, chews like an ox.' A disciple asked the Buddha: 'Why is this?' The Buddha said: 'In a previous life of this monk's past lives, he was an ox for seven hundred lifetimes. In this life, he has attained the Way, but his residual habits have not yet been exhausted; hence this is so.'