They agreed that the elder Pārśva should speak first, and he said: "The world should be made peaceable, with a long-lived king, plentiful harvests, and joy throughout the land, with none of the myriad calamities", to which the ascetic had no response and so was bound to become Pārśva's disciple, and he was given full ordination as a bhikṣu. Although he had to consent to this, he still was not convinced of the elder's virtues until he showed him he had mastered the Bases of Spiritual Power (r̥ddhipādāḥ), at which point he gained faith. Pārśva then taught him the 5 Faculties, the 5 Powers, the 7 Factors and the 8-fold Noble Path, and he eventually mastered the teaching.

Later, the central kingdom was besieged by the Kuṣāna King's army, who demanded 300,000 gold pieces in tribute. The King could not pay so much, as he had only 100,000. The Kuṣāna King therefore asked for the Buddha's begging bowl, the converted monk, and the 100,000 gold pieces for his tribute. Although the King of the central kingdom was unhappy, the monk persuaded him it would be for the good of the propagation of the Dharma which would spread across the four continents if he went with the Kuṣāna King. He was therefore taken away.

The Kuṣāna's King's Ministers, however, were unhappy, not thinking that the bhikṣu was priced correctly at 100,000 gold pieces. The King, who knew the worth of bhiksu, ordered that seven horses be starved for six days. The King then made an assembly and had the bhikṣu preach the Dharma. Even the horses, whose favourite food was placed in front of them, were entranced by the Teaching of the monk, and listened intently. Everybody was thereby convinced of his worth. He was then granted the name Aśvaghoṣa, Horse-Cry.

He travelled throughout northern India proclaiming the Dharma and guiding all through his wisdom and understanding, and he was held in great regard by the four-fold assembly, who knew him as The Sun of Merit and Virtue.