過去世で苦行者ナーラダとして自らの礼拝のために砂の仏塔を築き、最後の生でその過去を思い出したことで七歳にして阿羅漢となった阿羅漢

An Arahant who, in a past life as the ascetic Nārada, built a sand stūpa for his own worship, and in his last birth became an Arahant at the age of seven upon recalling that past.