首楞嚴義疏注經 1.630

1.630

即波羅奈國鹿野苑中，五仙所居修行處也。佛成道後先入此園，度五人耳。

This is the Deer Park (Mṛgadāva) in the country of Vārāṇasī, the place of practice where the five ṛṣis dwelt. After the Buddha attained the Way, he first entered this park to deliver the five persons.