ऐ वचन अब पड़ेगा निभाना

A solemn number from Nanubhai Vakil's 1944 film Kismatwala, penned by Shams Lakhnavi. The title — a pledge that 'now the vow must be kept' — points to the melodrama of promises and honour that animated the era's stunt-adventure plots. The singer is not identified in the surviving documentation.

Part of the Kismatwala soundtrack composed by the team of Shanti Kumar Desai and Master Ratanlal; the song's individual composer is undocumented. A vow-themed dramatic number would conventionally be set at a measured, declamatory tempo, the harmonium underlining the gravity of the lyric.