一切經音義 27.117

27.117

駟（息利反說文四馬共一乘謂四馬為駟玉篇逐也房星四謂之天駟也）。

Four-horse team (si): (xi + li [sì]. The Shuowen says: "Four horses together in one chariot; four horses are called a si." The Yupian says: "To pursue; the four stars of the Fang mansion are called the heavenly si").