Sri Vishnu-sahasra-nama – the thousand names of Lord Vishnu. According to the Mahabharata, these names were handed down to King Yudhishthir by the famous warrior Bhishma when Bhishma was dying after the battle of Kurukshetra. At that time, Yudhishthir asked Bhishma the following questions:

• Who is the one Lord of all?
• Who is the greatest refuge for all?
• Who is that one Divinity whom when praised bestows all good on humanity?
• What is the highest form of dharma?
• What sound, when uttered by any living being, will deliver him or her from the cycle of birth and death?

Bhishma answers that all beings can free themselves from any sorrow by chanting the Vishnu-sahasra-nama, the thousand names of the all-pervading Supreme Being, master of the worlds, supreme Lord over the demigods, and nondifferent from Brahman.
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Sri Narayana-kavacha: Armor of Narayana
This prayer is found in the eighth chapter of the Sixth Canto of the Srimad-Bhagavatam and provides those who chant it with a shield of protection from enemies both seen and unseen.

When Pariksit Maharaj asked his teacher Shukadev Goswami for protection against enemies, Sri Shukadev taught him this prayer. One who chants this prayer is sanctified and will be protected by Lord Vishnu in His various incarnations and by His various weapons and assistants.

Vishvarupa first heard the Narayana-kavacha prayer from Vishnu as Hayagriva and later described it to Indra: "This prayer constitutes subtle knowledge transcendentally connected with Narayana. One who employs this prayer is never disturbed or put in danger by the government, by plunderers, by evil demons, or by any type of disease."
(Srimad-Bhagavatam 6.8.38)
Download the prayer as a pdf.