Kasamh Se (English title: The Promise) is an Indian soap opera produced by Ekta Kapoor for Balaji Telefilms.

The show aired on Zee TV from 16 January 2006 to 12 March 2009, when the series ended due to cost issues.

After their father's death, the three sisters go to Mumbai to live with Jai Udai Walia, a ruthless business tycoon who knew their parents.

Their marriage is arranged but on the wedding day, Pia elopes with Pushkar.

Once Jai goes on a business trip, Pia follows him, spikes his drink, and sexually assaults him.

Sahil is killed and Pia frames Bani for Sahil's death and blackmails Jai: he can either let Bani spend life in jail or testify that she is mentally ill and she can spend only five years in a mental hospital.

Bani escapes from the hospital and is rescued by a man named Aparajit Deb who takes her under his wing.

Krishna and Atharva are kidnapped and murdered in front of Bani and Jai.

Struck by the loss of his children and instigation by Jigyasa, Jai kicks Bani out of the house.

Bani lives by the name of Maithili with Jai's aunt and her 5-year-old daughter Ganga in Meerut.

Ganga is revealed to have blood cancer and the only way she can survive is by a bone marrow transplant that can only be donated by family.

Jai learns the truth that Bani was never having an affair with Daksh and apologizes to her.

The family takes a trip to Bani's maternal home in Mount Abu.

Pia is revealed to be fine and had been pretending to be handicapped to save Bani because the real killer is one of their family members.

Bani lives as Pronita Mitra and has hazy nightmares of the night Meera tried to kill her.

Bani is invited to a party at the Walia mansion where she sees Meera and regains her memory.

Meera accepts all the allegations and tells Jai the truth that she spoilt his children because Ganga and Krishna are Bani's daughters and if he divorced her she will claim her share in the property.

Bani learns about it and with the help of Ganga's friend Rishi Tyagi and her hired actress Sonali expose Pratyush and Mittal family on the day of marriage.

Jigyasa lies to Walia family that she had hired Pronita to expose Meera.

The Walia family then make peace and Jigyasa apologizes to Bani for everything.

The three sisters talk about how they started their journey here in Mount Abu, they are happy together with their family and all ends well.