Job 1:4-5

4His sons used to go and hold a feast in the house of each one on his day, and they would send and invite their three sisters to eat and drink with them.

5And when the days of the feast had run their course, Job would send and consecrate them, and he would rise early in the morning and offer burnt offerings according to the number of them all. For Job said, "It may be that my children have sinned, and cursed God in their hearts." Thus Job did continually.