《资治通鉴·秦纪·秦纪三》
二世于是就在望夷宫实行斋戒，想祭祀泾水神，将四匹白马沉入河中。
二世乃斋于望夷宫，欲祠泾水，沈四白马。
Er Shi immediately performed a fast at the Wang Yi Palace, intending to offer a sacrifice to the god of the Jinghe River, sinking four white horses into the river.