Vishnu is one of the most worshiped and principal Gods of Hinduism. Among Bramha, Vishnu and Mahesh, Vishnu is seen as the sustainer of this world. Where as Bramha is creator and Shiva is destroyer.
As per Wikipedia:
In Vaishnavism, Vishnu is identical to the formless metaphysical concept called Brahman, the supreme, the Svayam Bhagavan, who takes various avatars as “the preserver, protector” whenever the world is threatened with evil, chaos, and destructive forces.[source]
Vedic literature has mentions of Vishnu but he is not as prominent as Indra or Varuna in Vedas. The following hymn talks about Vishnu’s three great steps
विष्णोर्नु कं वीर्याणि प्र वोचं यः पार्थिवानि विममे रजांसि ।
यो अस्कभायदुत्तरं सधस्थं विचक्रमाणस्त्रेधोरुगायः ॥१॥ (…)
I will now proclaim the heroic deeds of Visnu, who has measured out the terrestrial regions,
who established the upper abode having, wide-paced, strode out triply (…)
— Rigveda 1.154.1,
Vishnu Puraan is perhaps the most important Vaishnavait text and describes at great length Vishnu’s various avatars. The most important Puranas about Shri Vishnu are
1. Vishnu Puran
2. Garuda Puran
3. Vayu Puran
4. Narad Puran
5. Bhagvad Puran
Puranas are a giant body of text that has many variations of cosmology, mythology and great descriptions of Vishnu and various other Gods. In one of the Puranas it is mentioned that Vishnu sees the cosmos from his celestial left eye. Vayupurana states that the world came into existence from a golden egg called Hiranygarbha which is Vishnu.
Vishnu Puran describes Vishnu as the supreme being the Brahman. Vaishnavites believe that the purpose of life is to be united with this supreme being.
Vishnu will take 10 avatars on the earth to ensure the victory of Dharma over Adharma and to clean up the evil.
These avataras are
Vishnu Sahastranama (1000 names of Vishnu)
Vishnu Sahastranama lists 1000 names of Shri Vishnu. These names were listed in Mahabharata where Bhishma utters these names on the battle field.
Temples of Vishnu
Vishnu has thousands of temples all over the world. The largest of Vishnu Temples is in Cambodia, Angkor Wat.
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