From the beginning, time was divided into weeks, each consisting of six days of working and one of rest (Gen. 2:2, Gen. 2: 3;7:10;8:10, 8: 12;29:28). The references to this division of days becomes afterwards more frequent (Exo 34:22; Lev. 12:5; Num. 28:26; Deut. 16:16; 2-Chr 8:13; Jer. 5:24; Dan. 9:24;10:2, 10: 3). It has been found to exist among almost all nations.