This view is promoted in some sutras like the Pañcavimsatisahasrika-prajñaparamita-sutra. The idea is also found in the Laṅkāvatāra Sūtra, which mentions that bodhisattvas take the following vow: "I shall not enter into final nirvana before all beings have been liberated."
This perspective is found in sutras like the Pañcavimsatisahasrika-prajñaparamita-sutra and the Laṅkāvatāra Sūtra, which highlight the concept of bodhisattvas delaying their own nirvana until all beings are liberated.