Mahashivratri's Four Prahars, and the Agni Stambha Story Behind the Day

What is the four-Prahar worship on Mahashivratri night?

Mahashivratri has a prescribed ritual to worship Lord Sadashiva across all four quarters (Prahars) of the night — performing worship at the correct times during those quarters is said to bring Shiva's immense grace and special blessings.

On the day of Mahashivratri, there is a prescribed ritual to perform worship across the four quarters (Prahars) of the night. Worshipping Lord Sadashiva at the correct times during those four Prahars is said to bring Shiva's immense grace showering upon the worshipper, along with His special blessings.

Did Shiva first appear as the Agni Stambha on Mahashivratri?

In the Vidyeshvara Samhita of the Shiva MahaPurana, Sadashiva first appeared as an endless pillar of fire (Agni Stambha) to settle a supremacy dispute between Brahma and Vishnu — on Margashirsha Krishna Paksha Tritiya, under Ardra Nakshatra, not on Mahashivratri itself as many mistakenly claim.

In the Vidyeshvara Samhita of the Shiv Puran, it's described that when a competition arose between Brahma and Vishnu to establish who was greater, Lord Sadashiva appeared between them for the first time in the form of a Jyotirlinga, a pillar of fire (Agni Stambha). At the time Sadashiva appeared as the pillar of fire, the tithi was Margashirsha Krishna Paksha Tritiya and the nakshatra was Ardra Nakshatra. Many people make a slight mistake, and written content in various places claims Shiva appeared for the first time as a pillar of fire on Mahashivratri — but that isn't so; Shiva appeared in the month of Margashirsha Maas.

How did Brahma and Vishnu search for the ends of the pillar, and what happened with the Ketaki flower?

Brahma went upward as a swan and Vishnu downward as a boar to find the pillar's ends first — Vishnu returned honestly admitting failure, but Brahma, unable to reach the top, persuaded a falling Ketaki flower to falsely testify that he had seen it, in exchange for boons.

After the Agni Stambha appeared, Brahma and Vishnu went to discover its ends — Brahma took the form of a swan and went upward, Vishnu took the form of a boar and went downward, agreeing that whoever found the end and returned first would be deemed superior. As Brahma searched upward, many kalpas passed (one kalpa being roughly 4 billion human years) with no end found, until he saw a Ketaki (Kewra) flower falling from above. Brahma asked the flower to bear false witness — to testify that he had reached and seen the pillar's uppermost end — promising numerous boons in return, and brought the flower along with him. Vishnu returned disappointed, unable to find the end, but did not abandon truthfulness even then and spoke the truth about His failure.

Why did Kaal Bhairava manifest, and what did he do to Brahma for his falsehood?

After Vishnu worshipped the falsely victorious Brahma with sixteen rituals, Lord Shiva manifested in anger directly from the pillar of fire, and a fearsome being — Kaal Bhairava — appeared from His forehead and severed Brahma's fifth head with his fingernails for speaking untruth, incurring Brahmahatya himself in the act.

Because Brahma had claimed superiority and the Ketaki flower (Ketaki Curse) had given false testimony confirming it, Vishnu worshipped Brahma with sixteen rituals (Shodashopachara). When this deed occurred, Lord Shiva manifested in anger directly in front of them out of the pillar of fire — from His forehead, between His two eyebrows, a fearsome being manifested: Kaal Bhairavaa. Kaal Bhairava severed the fifth head of Brahma, who had spoken untruth, with his fingernails. By taking Brahma's severed skull, Lord Bhairava incurred the sin of Brahmahatya (slaying of a Brahmin) himself.

What curse and boon did Shiva give Brahma for lying about the pillar?

Brahma pleaded for forgiveness, with Vishnu interceding on his behalf, and Shiva was pacified — but still cursed Brahma to never be worshipped in the mortal realm, while also granting him the boon of being worshipped everywhere in Yajnas and in the form of Vishwakarma.

Brahma pleaded for forgiveness, and Lord Vishnu also sought forgiveness on his behalf. Lord Shiva was pacified, but He cursed Brahma that he would not be worshipped in the mortal realm (Mrityu Loka). However, He also granted a boon that Brahma would be worshipped everywhere in Yajnas (sacrificial rituals) and in the form of Vishwakarma.

Which events does Mahashivratri actually commemorate?

Alongside the boon to Brahma, that day also saw the origin of the Panchanana form, the Panchakshari mantra's initiation, and the Pranava and Tripada Gayatri's initiation — all occurring on the tithi conjoined with Phalguna Krishna Paksha Trayodashi and Chaturdashi, which is what Mahashivratri actually designates.

Along with the boon to Brahma, many other boons were granted that day: the origin of the Panchanana form, the initiation and instruction of the Panchakshari Mantra, and the initiation and instruction of Pranava Gayatri and Tripada Gayatri. All of these occurrences took place on the tithi conjoined with Phalguna Krishna Paksha Trayodashi and Chaturdashi — this is what is designated as Mahashivratri, and on that day Lord Shiva especially bestows grace upon everyone.

What basic worship is prescribed for Mahashivratri?

Observe a fast that day, and during the four Prahars perform worship and Aarti with five offerings (Panchopachara) or ten offerings (Dashopachara) according to capacity, chanting Shiva's name, mantras, or stotras to receive His grace and blessings.

Observe a fast on Mahashivratri, and during the four Prahars, perform worship and Aarti with five offerings (PanchopacharaThe basic five-item worship sequence — incense, lamp, fragrance, flower, and food — performed for a deity after the opening rites of a sadhana.) or ten offerings (Dashopachara) according to one's capacity, chanting Lord Shiva's name, mantras, or reciting stotras to receive His grace and blessings.