《仪礼·大射仪》
如果让二人都献觯就依次进献，把觯放在篚里，在东阶下都面朝北行两次稽首礼。
若命皆致，则序进，奠觯于篚，阼阶下皆北面再拜稽首。
If both of them are to present the cup in turn, they should present it following the order. Put the cups in the trays, stand at the bottom of the eastern steps with their faces to the north, and kowtow twice as they walk towards the king.