The Heart Sūtra, a text of a single page, presents Avalokiteśvara’s teaching to Śāriputra that the five aggregates are empty, that form is not other than emptiness and emptiness not other than form. It ends with a mantra. It is chanted daily across East Asian and Tibetan Buddhism.
Heart Sūtra
The shortest Perfection of Wisdom sūtra: form is emptiness, emptiness is form.
Also: Heart Sutra, Prajnaparamita Hridaya