Tkies-kaf (Yiddish: תקיעת-כף, 'The Handshake'; Polish: Ślubowanie, 'The Oath') is a partially lost 1924 Polish silent film. Set mainly in Vilna, it revolves around a vow made between two friends — Khaim and Borekh – that their future children shall marry each other. Many years later, the prophet Elijah, disguised as various characters, works to ensure this oath comes to fruition. These efforts are impaired by Borekh's friend Shmuel, who seeks to marry Khaim's daughter and keep his hidden fortune. The film's production was troubled by an initial lack of director; producer Leo Forbert's pick, American director Sidney M. Goldin, was occupied by another project, leading head actor Zygmunt Turkow (playing Elijah) to volunteer to direct the project. Other prominent actors in the film include Turkow's wife Ester Rachel Kamińska (playing Khaim's widow), and their daughter Ida Kamińska (playing Khaim's daughter Rokhl). The film was released domestically with Polish intertitles, and internationally in Yiddish. An adaptation titled Dem Rebns Koyekh was made by an American team in 1933, adding new scenes and Yiddish audio narration by Joseph Buloff.