Devibhagavatapurana 11.5.15

11.5.15

rudrākṣaṃ dhārayenmūrdhni kaṇṭhe sūtre kare'thavā |
suvarṇamaṇisambhinnaṃ śuddhaṃ nānyairdhṛtaṃ śivam ||

It is advisable to use the true Rudrâksam with gold and jewel, on the head, neck or on one's hand. Never use the Rudrâksam worn by another. Use Rudrâksam always with devotion; never use it while you are impure. Even the grass that grows with the air in contact with the Rudrâksa tree, goes verily to a holy region for ever. Jâbâla Muni says in the S’ruti:-- lf a man wearing Rudrâksam commits a sin, he gets deliverance from that sin. Even if animals hold Rudrâksam, they become S’iva; what of men! The devotees of S’rî Rudra should always use at least one Rudrâksa on the head. Those great devotees, who with Rudrâksam on take the name of the Highest Self S’ambhu, get themselves freed of all sorts of sins and pains. Those who are ornamented with Rudrâksam are the best devotees. It is highly incumbent on those who want their welfare to wear Rudrâksam. Those who hold Rudrâksam on their ears, crown hair, neck, hands, and breast, get Brahmâ, Visnu, and Mahes'vara under them as their Vibhûtis (manifestations, powers). The Devas and all those Risis that started the Gotra, the Âdipurusas (the first chief men in several families), held with reverence the Rudrâksams. All the other Munis, that descended from their families, the ardent followers of S’rauta Dharma, the pure souled, held the Rudrâksams. It may be, that many might not like at first to hold this Rudrâksam, the visible giver of liberation and so well written in the Vedas; but after many births, out of the Grace of Mahâdeva many become eager to take the Rudrâksams. The Munis that are the Jâbâla Sâkhîs are famous in expounding the inestimable greatness of Rudrâksams.
The effect of holding Rudrâksams is well known in the three worlds. Punyam (great merit) arises from the mere sight of Rudrâksams; ten million times that merit arises by its touch; and by wearing it, one hundred Koti times the fruit arises and if one makes Japam every day, then one lakh koti times the punyam arises. There is no manner of questionings in this.