Keluaran 33:10

33:10 When all the people would see the pillar of cloud standing at the entrance of the tent, all the people, each one at the entrance of his own tent, would rise and worship. ¹ 

[33:10]  ¹ tn All the main verbs in this verse are perfect tenses continuing the customary sequence (see GKC 337 §112.kk). The idea is that the people would get up (rise) when the cloud was there and then worship, meaning in part bow down. When the cloud was not there, there was access to seek God.