妙法蓮華經玄贊 3.121

3.121

贊曰：下四頌中有三：初一頌自稱長子以請決，次一頌半陳眾久從佛化以請說，後一頌半兼陳自他聞法悟解即生歡喜以請說。此初也。佛於二足多足無足一切中尊，今云兩足尊，於三類中兩足為貴，能入道故。謂人天類，佛亦兩足，故言兩足尊。聲聞眾中鶖子第一，故名長子。

The Eulogy says: Below are four verses, comprising three parts: first, one verse in which he calls himself the eldest son to request a definitive resolution; next, a verse and a half stating that the assembly has long followed the Buddha’s instruction to request the teaching; finally, a verse and a half setting forth that both he and others will give rise to great joy upon awakening to the Dharma to request the teaching. This is the first part. The Buddha is honored among all beings—two-footed, many-footed, and footless; here he is called the “Honored among Two-Footed Beings” because among the three types, the two-footed are the most noble, as they are capable of entering the path. That is, the classes of humans and devas: the Buddha is also two-footed, hence he is called the “Honored among Two-Footed Beings.” Among the assembly of śrāvakas, Śāriputra is foremost, and is therefore called the “eldest son.”