仁王護國般若經疏 1.27

1.27

耆闍崛山，此翻靈鷲。釋迦菩薩昔為鷲鳥，於此山中養育父母，從此得名，故名靈鷲。又王舍城南有屍陀林，鷲鳥居之，多食死人。人欲死者，鷲翔其家悲鳴作聲，人以預知。知人死，故稱靈鷲。又山有五峯，東方象頭、南方馬頭、西方羊頭、北方師子頭、中央鷲頭，亦得名為鷲山也。問：佛何故偏於王城中向鷲山說法耶？答：依《法華論》云「如王舍城勝於餘城，耆闍崛山勝於餘山。以佛在勝處故，顯此法門勝也。」今此般若是最勝法故，偏就王城耆山說也。「中」者，表說中道般若也。

Gṛdhrakūṭa Mountain: this is translated as Numinous Vulture. Śākyamuni Bodhisattva was once a vulture in the past, nurturing his parents in this mountain; it took its name from this, hence it is called Numinous Vulture. Furthermore, south of Rājagṛha there is a śmaśāna (charnel ground) where vultures reside and consume many dead bodies. When someone is about to die, vultures soar over their home and cry mournfully, whereby people know beforehand. Because they know of people's deaths, it is called Numinous Vulture. Moreover, the mountain has five peaks: the Elephant Head in the east, the Horse Head in the south, the Sheep Head in the west, the Lion Head in the north, and the Vulture Head in the centre; hence it also obtains the name Vulture Mountain. Question: Why did the Buddha preach the Dharma specifically facing Vulture Mountain while in the royal city? Answer: Relying on the Fahua lun (Saddharmapuṇḍarīkopadeśa), it says: "Just as Rājagṛha is superior to other cities, Gṛdhrakūṭa Mountain is superior to other mountains. Because the Buddha was in a superior place, he revealed that this Dharma door is superior." Now, since this prajñā is the most superior Dharma, he specially expounded it approaching the royal city and Gṛdhrakūṭa Mountain. "Among" signifies expounding the Middle Way prajñā.