The salutary and laborious activity of Kentigern must often have encroached upon the regions which were specially within the sphere of Columba. But the generous heart of Columba was inaccessible to jealousy. He was, besides, the personal friend of Kentigern and of King Roderick.[47] The fame of the Bishop of Strathclyde's apostolic labours drew him from his isle to do homage to his rival in love and good works. He arrived from Iona with a great train of monks, whom he arrayed in three companies at the moment of their entrance into Glasgow. Kentigern distributed in the same way the numerous monks who surrounded him in his episcopal monastery, and whom he led out to meet the abbot of Iona. He divided them, according to their age, into three bands, the youngest of whom walked first; then those who had reached the age of manhood; and last of all, the old and grey-haired, among whom he himself took his place. They all chanted the anthem, "They shall sing in the ways of the Lord: that great is the glory of the Lord. The path of the just is made: and the way of the saints is prepared." The monks of Iona, on their side, chanted the versicle, "The saints shall go from strength to strength: and unto the God of gods appeareth every one of them in Sion."[48] From every side echoed the Alleluia; and it was to the sound of these words of Holy Scripture that the Apostles of the Picts and Scots met at what had been the extreme boundary of the Roman empire, and limit of the power of the Caesars, and upon a soil henceforth for ever freed from paganism and idolatry. They embraced each other tenderly, and passed several days in intimate and friendly intercourse. The historian, who has preserved for us the account of this interview, does not conceal a less edifying incident. He confesses that some robbers had joined themselves to the following of the abbot of Iona, and that they took advantage of the general enthusiasm to steal a ram from the Bishop's flock. They were soon taken; but Kentigern pardoned them. Columba and his fellow Apostle exchanged their pastoral staves before they parted, in token of mutual affection. The staff of S. Columba, afterwards used by S. Kentigern, was in later times given to S. Wilfred, who placed it in the monastic church he founded at Ripon.