Shattila Ekadashi is the Krishna Paksha Ekadashi of the Pausha (Magha) month — a Vishnu vrat in which sesame (til) is used in six different ways. "Shat" means six and "til" means sesame — hence "Shattila Ekadashi."
The defining feature of Shattila Ekadashi is this sixfold use of sesame, from bathing to donation. By the Amanta reckoning followed in Maharashtra it falls in Pausha Krishna Paksha, while North Indian (Purnimanta) panchangs call the same tithi Magha Krishna Ekadashi ("Maghi Ekadashi") — one and the same day.
Observing the Shattila Ekadashi vrat and donating sesame is believed to destroy sins and drive away poverty and suffering. The importance of charity alongside the fast is particularly emphasised on this day — keeping the fasting rules alone isn't considered enough; it is the act of giving that completes the vrat.
Two distinct traditions are told about Shattila Ekadashi.
In one popular vrat-katha, a devout Brahmin woman kept a strict fast and performed her religious duties regularly, but never once gave food or wealth in charity to gods or Brahmins. One day, Vishnu himself came to her door disguised as a beggar asking for alms; she dropped nothing but a lump of clay into his bowl. In time, after her death, she was granted a palace in heaven — but it stood completely empty of food and provisions. Celestial maidens then explained to her the importance of the Shattila Ekadashi vrat and sesame donation. Once she took it up with faith, her house filled with every provision. The moral of this story: a fast without charity remains incomplete.
The Gita Press–published Puranic text, however, does not include this widow's story at all. There, the sage Pulastya tells the sage Dalbhya that observing the Magha (Amanta Pausha) Krishna Ekadashi vrat, along with the sixfold use of sesame, frees souls in the mortal world from sin. For the puja vidhi and the six-sesame teaching, this directly-checked Puranic text is treated as the primary source; the popular vrat-katha above is recorded as a separate, widely-told tradition.
On the morning of Ekadashi, bathe and worship Vishnu/Shri Krishna. Keep the fast through the day, hold a night vigil, and break the fast (parana) the next day, on Dwadashi. Sesame holds a special place in the puja — mixing sesame into bathwater, applying a sesame paste, and offering sesame in the sacred fire are among the rites traditionally performed.
The very name "Shattila" rests on this sixfold use of sesame. Per the original verse: bathing in sesame-infused water (til-snan), a sesame paste (til-udvartan), sesame offered in the sacred fire (til-hom), sesame-infused water for offering (til-udak), donating sesame (til-daan), and eating sesame (til-bhojan) — these six uses of sesame are what gave this Ekadashi the name "Shattila" (six-sesame).
Some traditions replace the fourth item, sesame-infused water, with a sesame tarpan (ancestral water-offering) instead; and some sources give "preparing sesame-based dishes" as the sixth use. The core remains six uses of sesame, though the exact list varies slightly by tradition.
The exact form of the fast — nirjala (waterless), phalahar (fruits only), or a single meal — varies by family tradition. Rice and other grains are widely avoided on Ekadashi. Keep a night vigil, and break the fast the next day, on Dwadashi tithi. Donating sesame to a Brahmin or to those in need after the puja is considered a special part of this Ekadashi. A strict nirjala or prolonged fast is not suitable for everyone — those with diabetes, pregnancy, advanced age, or illness should choose phalahar or a gentler fast, ideally with a doctor's advice.
The puja is accompanied by chanting the names of Vishnu/Shri Krishna. The opening line of the traditional argya-mantra is "Krishna Krishna kripalu-stvam agatinam gatir-bhava…" — meaning, roughly, "O compassionate Krishna, be the refuge of the refugeless; be gracious to those drowning in the ocean of worldly existence"; a traditional Vishnu aarti is also recited.