《新唐书·列传·卷一百四十一》
使者与吐蕃大臣十余人相对而列，酋长百余人坐坛下。坛上设一大榻，钵掣逋登榻，向天告盟，有一人在旁边向下译述。
使者与虏大臣十余对位，酋长百余坐坛下，上设巨榻，钵掣逋升，告盟，一人自旁译授于下。
The envoy and more than ten ministers of Tubo sat opposite each other, and more than one hundred chieftains sat under the altar. A large couch was set up on the altar, and Bojiebu ascended the couch to announce the covenant to the sky. Someone was beside him translating it down.