In Whose Dhamma
Then Ven. Assaji, arising early in the morning, taking his robe and bowl, entered Rajagaha for alms: Gracious in the way he approached and departed, looked forward and behind, drew in and stretched out his arm; his eyes downcast, his every movement consummate.
Sariputta the wanderer saw Ven. Assaji going for alms in Rajagaha: gracious… his eyes downcast, his every movement consummate. On seeing him, the thought occurred to him: “Surely, of those in this world who are arahants or have entered the path to arahantship, this is one. What if I were to approach him and question him: ‘On whose account have you gone forth? Who is your teacher? In whose Dhamma do you delight?'”
But then the thought occurred to Sariputta the wanderer: “This is the wrong time to question him. He is going for alms in the town. What if I were to follow behind this monk who has found the path for those who seek it?”