Subsequent to Mochuda's foundation of Rahen his miracles and the marvels he wrought spread his fame far and wide through Ireland and through Britain, and multitudes came to him from various parts of those countries to give themselves to the service of God under his guidance. In the beginning he refused worldly gifts from others although his church was honoured and patronised by neighbouring kings and chieftains who offered him lands and cattle and money and many other things. Mochuda kept his monks employed in hard labour and in ploughing the ground for he wanted them to be always humble. Others, however, of the Saints of Erin did not force their monks to servile labour in this fashion.
Mochuda was consecrated bishop by many saints and from time to time he visited his parish in Kerry, but as a rule he remained at Rahen with his monks, for it is monks he had with him not clerics.
On a certain day in the (early) springtime there came to tempt him a druid who said to him:—"In the name of your God cause this apple-tree branch to produce foliage." Mochuda knew that it was in contempt for divine power the druid proposed this, and the branch put forth leaves on the instant. The druid demanded "In the name of your God, put blossom on it." Mochuda made the sign of the cross [over the twig] and it blossomed presently. The druid persisted:—"What profits blossom without fruit?" [said the druid]. Mochuda, for the third time, blessed the branch and it produced a quantity of fruit. The druid said:—"Follower of Christ, cause the fruit to ripen." Mochuda blessed the tree and the fruit, fully ripe, fell to the earth. The druid picked up an apple off the ground and examining it he saw it was quite sour, whereupon he objected:—"Such miracles as these are worthless since it leaves the fruit uneatable." Mochuda blessed the apples and they all became sweet as honey, and in punishment of his opposition the magician was deprived for a year of his eyesight. At the end of a year he came to Mochuda and did penance, whereupon he received his sight back again and he returned home rejoicing.
On another occasion there came to Mochuda a secular who brought with him his deaf and dumb son whom he besought the saint to heal. Mochuda prayed to God for him and said, "My son, hear and speak." The boy answered immediately and said, "Man of God, I give myself and my inheritance to you for ever," and thenceforth he possessed the use of all his senses and members.
Another day a young man who had contracted leprosy came to Mochuda showing him his misery and his wretched condition. The saint prayed for him and he was restored to health.
At another time there came to Mochuda a man whose face was deformed. He besought the saint's aid and his face was healed upon the spot.
On yet another occasion in the springtime a poor man who dwelt some distance from the monastery of Rahen, came to Mochuda, and asked the loan of two oxen and a ploughman to do a day's ploughing for him. But Mochuda, as we have already said, had no cattle, for it was the monks themselves who dug and tilled the soil. Mochuda summoned one of his labourers named Aodhan whom he ordered to go into the nearest wood to bring back thence a pair of deer with him and go along with them to the poor man to do the spring work for him. Aodhan did dutifully all that Mochuda bade him—he found the two deer, went with the poor man and ploughed for him till the work was completed when the deer returned to their habitat and Aodhan to Mochuda.
On another day there came to Mochuda a man troubled by the devil. Mochuda cured him at once, driving the demons from him and the man went his way thanking God and Mochuda.
Once, when the brethren were at work in the fields and in the kitchen, Mochuda went to the mill to grind meal for the monk's use, and nine robbers, who hated him, followed with the intention of murdering him. The chief of the band sent each member of the gang to the mill in turn. Not one of them however could enter the mill because of a violent flame of fire which encircled the building round about, through the goodness of God protecting Mochuda from the robbers. The latter, through the mill door, watched Mochuda who slept portion of the time and was awake another portion. And while he slept the mill stopped of itself, and while he was awake it went of its own accord. The gang thereupon returned to the chief and told him all they had seen, which, when he heard, he became enraged. Then he hastened himself to the mill to kill Mochuda. But he experienced the same things as all the others and he was unable to hurt Mochuda. He returned to his followers and said to them—"Let us stay here till he comes out of the mill, for we need not fear that he will call help nor need we fear his arm." Shortly afterwards Mochuda came out carrying his load. The robbers rushed on him, but they were unable to do him any injury for as each man of them tried to draw his weapon his hands became powerless, so he was unable to use them. Mochuda requested them to allow him pass with his burden and he promised them on his credit and his word that he should return to them when he had deposited the sack in safety. They took his word and he went, deposited his bag of meal in the kitchen, and returned meekly to martyrdom. The brethren imagined he had gone to a quiet place for prayer as was his custom. When he returned to the robbers they drew their weapons several times to kill him but they were unable to do so. Seeing this wonder they were moved to repentance and they gave themselves to God and to Mochuda for ever and, till the time of their death, they remained under his guidance and rule and many subsequent edifying and famous acts of theirs are recorded.
An angel came to Mochuda at Rahen on another occasion announcing to him the command of God that he should go that same day to Mac Fhiodaig, king of his own region of Kerry Luachra, and administer to him Holy Communion and Confession as he was on the point of death. Mochuda asked the angel how he could reach Kerry that day from Rahen. The angel thereupon (for reply) took him up through the air in a fiery chariot until they arrived at the king's residence. Mochuda administered Holy Communion and Confession and the king having bestowed generous alms upon him departed hence to glory. Mochuda returned that same day to Rahen where he found the community singing vespers.