“Is there any reference in the Pāli Canon to Maitreya, the next Buddha’s aspiration being made to the Buddha Gotama?” Answered by Ajahn Amaro and Ajahn Kaccāna. [Tipiṭaka] [Metteyya Bodhisatva] [Buddha/Biography] // [Āgama]
Sutta: DN 26.25: The Pāli Nikaya’s only reference to Metteyya Bodhisattva.
Āgama: MĀ 66: Two aspirants make vows to the Buddha Gotama.