妙法蓮華經玄贊 1.99

1.99

劫賓那者，此云房宿，佛與同房宿，化作老比丘為之說法，因而得道，故云房宿。或云房星，房星現時生，故云房星。

As for Kapphina (Kapphiṇa), here it is translated as 'Lodging in the Same Room'. The Buddha lodged in the same room with him, transformed into an old monk, preached the Dharma for him, and thereby Kapphina attained the Way; hence he is called 'Room Lodging'. Or he is called 'Room Constellation', because he was born when the Room Constellation appeared; hence 'Room Constellation'.