The Jataka, Vol. II, tr. by W.H.D. Rouse, , at sacred-texts.com
"All the year long never ceasing," etc.--This story the Master told while dwelling at Jetavana, about Elder Lāḷudāyī, or Udāyī the Simpleton.
This man, we learn, was unable to get out a single sound in the presence of two or three people. He was so very nervous, that he said one thing when he meant another. It happened that the Brethren were speaking of this as they sat together in the Hall of Truth.  The Master came in, and asked what they were talking of as they sat there together. They told him. He answered, "Brethren, this is not the first time that Lāḷudāyī has been a very nervous man. It was just the same before." And he told an old-world tale.
Once on a time, while Brahmadatta was king of Benares, the Bodhisatta was born into a certain brahmin family in the kingdom of Kāsi. When he came of age, he went to study at Takkasilā. On returning he found his family poor; and he bade his parents farewell and set out to Benares, saying to himself, "I will set up my fallen family again!"
At Benares he became the king's attendant; and he grew very dear to the king and became a favourite.
Now his father lived by ploughing the land, hut he had only one pair of oxen; and one of them died. He came before the Bodhisatta, and said to him, "Son, one of my oxen is dead, and the ploughing does not go on. Ask the king to give you one ox!"
"No, Father," answered he, "I have but just now seen the king; I ought not to ask him for oxen now:--you ask him."
"My son," said his father, "you do not know how bashful I am. If there are two or three people present I cannot get a word out. If I go to ask the king for an ox, I shall end by giving him this one!"
"Father," said the Bodhisatta, "what must be, must be. I cannot ask the king; but I will train you to do it." So he led his father to a cemetery where there were clumps of sweet grass; and tying up tufts of it, he scattered them here and there, and named them one by one, pointing them out to his father: "That is the King, that is the Viceroy, this is the Chief Captain. Now, Father, when you come before the king, you must first say--'Long live the king!' and then repeat this verse, to ask for an ox;" and this is the verse he taught him:
 For the space of a whole year the man learnt this couplet; and then he said to his son--"Dear Somadatta, I have learnt the lines! Now I can say it before any man! Take me to the king."
So the Bodhisatta, taking a suitable present, led his father into the king's presence. "Long live the king!" cried the brahmin, offering his present.
"Who is this brahmin, Somadatta?" the king asked.
"Great king, it is my father," he answered.
"Why has he come here?" asked the king. Then the brahmin repeated his couplet, to ask for the ox:--
The king saw that there was some mistake. "Somadatta," said he, smiling, "you have plenty of oxen at home, I suppose?"
"If so, great king, they are your gift!"
At this answer the king was pleased. He gave the man, for a brahmin's offering, sixteen oxen, with fine caparison, and a village to live in, and sent him away with great honour. The brahmin ascended a car drawn by Sindh horses, pure white, and went to his dwelling in great pomp.
As the Bodhisatta sat beside his father in the chariot, said he, "Father, I taught you the whole year long, and yet when the moment came you gave your ox to the king!" and he uttered the first stanza:--
 When he heard this, the brahmin uttered the second stanza:
When the Master by this story had shown how Simpleton Udāyī had been just as bashful before as he was then, he identified the Birth:--" Lāḷudāyī was the father of Somadatta, and I was Somadatta myself."
115:1 Fausbøll, Five Jātakas, p. 31; Comm. on Dhammapada verse 152 (p. 317 of F.'s edition).