Exo Exodus, chapter Book of Exodus, chapter 13
When they traveled during the daytime, Yahweh went in front of them in a tall white cloud to show them the way. During the night, he went in front of them in a tall cloud that looked like a fire. By doing that, he enabled them to travel in the daytime and also at nighttime. Exo 14:19; Num 14:14; Deu 1:33; Deu 4:37; Psa 78:14; Psa 105:39; Neh 9:19